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Guided learning paths

Learn by doing,
master real skills

Bite-size lessons, hands-on practice after every concept, and an AI tutor that explains the why on every single question.

116Courses
184.2k+Practice Qs
35.7kLearners
CFA Level 3
2,505 MCQs
SQL for Analysts
2,160 MCQs
Machine Learning: Supervised Mastery
1,270 MCQs
TypeScript Crash Course
324 MCQs
CFA Level 3
2,505 MCQs
SQL for Analysts
2,160 MCQs
Machine Learning: Supervised Mastery
1,270 MCQs
TypeScript Crash Course
324 MCQs
CFA Level 2
1,320 MCQs
Machine Learning: Ensemble Methods & Mastery
1,548 MCQs
Vibe Coding Mastery
2,040 MCQs
Thermodynamics: The Laws That Run Everything
1,990 MCQs
CFA Level 2
1,320 MCQs
Machine Learning: Ensemble Methods & Mastery
1,548 MCQs
Vibe Coding Mastery
2,040 MCQs
Thermodynamics: The Laws That Run Everything
1,990 MCQs
CFA Level 1
1,646 MCQs
Machine Learning: Unsupervised Mastery
1,756 MCQs
Verilog & Digital Design Mastery
1,910 MCQs
Taxes for Salaried Indians
1,590 MCQs
CFA Level 1
1,646 MCQs
Machine Learning: Unsupervised Mastery
1,756 MCQs
Verilog & Digital Design Mastery
1,910 MCQs
Taxes for Salaried Indians
1,590 MCQs
Lesson complete +25 XP
7-day streak
AI tutor answered
116Courses live
184.2k+Practice MCQs
35.7kLearners
4.7Average rating
The catalogue

All courses116

Every course is built the same way — read a little, practise a lot, and get an explanation the moment you get something wrong.

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CFA Level 3
Exam PrepFinance

CFA Level 3

CFA Level 3 practice across all 10 topic areas - Behavioral Finance, Capital Market Expectations, Asset Allocation, Fixed Income and Equity PM, and the IPS.

AI tutorCertificate
19h2.5k practice Qs
400 credits799 credits50% off
Start free
CFA Level 2
Exam PrepFinance

CFA Level 2

CFA Level 2 practice across all 10 topic areas — Ethics, Quant, Economics, FRA, Corporate Issuers, Equity Valuation, Fixed Income, Derivatives and more.

5.0
AI tutorCertificate
24h1.32k practice Qs
450 credits899 credits50% off
Start free
CFA Level 1
Exam PrepFinance

CFA Level 1

CFA Level 1 prep covering all 10 topics — Ethics, Quant Methods, Economics, FRA, Corp Issuers, Equity, Fixed Income, Derivatives, Alternatives, Portfolio Mgmt.

5.0
AI tutorCertificate
30h1.65k practice Qs
500 credits999 credits50% off
Start free
SQL for Analysts
FundamentalsData And Analytics

SQL for Analysts

Write queries that answer real business questions — practise joins, aggregation and window functions through MCQs with instant explanations.

AI tutorCertificate
24h2.16k practice Qs
450 credits899 credits50% off
Start free
Machine Learning: Ensemble Methods & Mastery
FundamentalsAI

Machine Learning: Ensemble Methods & Mastery

Practice ensemble methods through MCQs — bagging, random forests, AdaBoost, gradient boosting, XGBoost, LightGBM, stacking and voting.

AI tutorCertificate
17h1.55k practice Qs
324 credits649 credits50% off
Start free
Machine Learning: Unsupervised Mastery
FundamentalsAI

Machine Learning: Unsupervised Mastery

Practice unsupervised learning through MCQs — k-means, hierarchical and density clustering, GMMs, PCA, t-SNE, UMAP and anomaly detection.

AI tutorCertificate
17h1.76k practice Qs
324 credits649 credits50% off
Start free
Machine Learning: Supervised Mastery
FundamentalsAI

Machine Learning: Supervised Mastery

Practice supervised learning through MCQs — regression, logistic regression, kNN, Naive Bayes, trees, SVMs, multi-class and calibration.

AI tutorCertificate
14h1.27k practice Qs
274 credits549 credits50% off
Start free
Vibe Coding Mastery
FundamentalsAI

Vibe Coding Mastery

Ship real software with AI coding agents — practise the workflow through MCQs with instant, explained answers.

AI tutorCertificate
23h2.04k practice Qs
424 credits849 credits50% off
Start free
Verilog & Digital Design Mastery
FundamentalsElectronics

Verilog & Digital Design Mastery

Write RTL that synthesises the way you intended — practise Verilog and digital design through MCQs with instant explanations.

AI tutorCertificate
21h1.91k practice Qs
400 credits799 credits50% off
Start free
TypeScript Crash Course
FundamentalsProgrammingWeb Development

TypeScript Crash Course

TypeScript MCQ practice, condensed — 324 questions across 36 lessons covering interfaces, generics, narrowing, utility types and configuration.

AI tutorCertificate
4h324 practice Qs
149 credits299 credits50% off
Start free
Thermodynamics: The Laws That Run Everything
General Interest

Thermodynamics: The Laws That Run Everything

Get energy, entropy and cycles straight in your head — practise thermodynamics through MCQs with instant worked explanations.

AI tutorCertificate
22h1.99k practice Qs
400 credits799 credits50% off
Start free
Taxes for Salaried Indians
Finance

Taxes for Salaried Indians

Stop guessing at your payslip and ITR — practise Indian salary tax rules through MCQs with instant explanations.

AI tutorCertificate
18h1.59k practice Qs
324 credits649 credits50% off
Start free
System Design: Foundations & Scaling
Interview MasteryCore CS

System Design: Foundations & Scaling

Get interview-ready on system design fundamentals through rapid MCQ practice with instant, explained answers.

AI tutorCertificate
16h1.32k practice Qs
274 credits549 credits50% off
Start free
Statistics & Probability for Data Roles
FundamentalsData And Analytics

Statistics & Probability for Data Roles

Reason about uncertainty like an analyst — practise distributions, testing and inference through MCQs with instant explanations.

AI tutorCertificate
19h1.7k practice Qs
350 credits699 credits50% off
Start free
Startup Equity & ESOPs Explained
Finance

Startup Equity & ESOPs Explained

Practise startup equity through MCQs — ESOPs, vesting, cliffs, cap tables, dilution and Indian tax at exercise and sale, with an explanation on every answer.

AI tutorCertificate
13h1.21k practice Qs
250 credits499 credits50% off
Start free
SBSpring Boot Crash Course
FundamentalsWeb DevelopmentProgramming

Spring Boot Crash Course

Spring boot MCQ practice, condensed — 363 questions across 33 lessons covering the full syllabus.

AI tutorCertificate
4h363 practice Qs
199 credits299 credits33% off
Start free
React Crash Course
FundamentalsWeb Development

React Crash Course

React MCQ practice, condensed — 324 questions across 36 lessons covering hooks, state, effects, refs, context and rendering behaviour.

AI tutorCertificate
4h324 practice Qs
149 credits299 credits50% off
Start free
RAG Systems Crash Course
FundamentalsAI

RAG Systems Crash Course

RAG MCQ practice, condensed — 324 questions across 36 lessons covering chunking, embeddings, retrieval, re-ranking, evaluation and production.

AI tutorCertificate
4h324 practice Qs
149 credits299 credits50% off
Start free
Python Interview Mastery
Interview MasteryProgramming

Python Interview Mastery

Crack Python interviews with 1,200+ MCQs focused on traps, edge cases, and internals — instant explanations after every wrong answer.

4.2
AI tutorCertificate
14h1.77k practice Qs
300 credits599 credits50% off
Start free
Python Crash Course
FundamentalsProgramming

Python Crash Course

Python MCQ practice, condensed — 384 questions across 48 lessons covering the full syllabus from syntax and OOP to the GIL and interview traps.

AI tutorCertificate
5h384 practice Qs
199 credits299 credits33% off
Start free
Prompt Engineering for Business Professionals
Soft SkillsAI

Prompt Engineering for Business Professionals

Get usable work out of AI tools, not drafts you rewrite — practise business prompting through MCQs with instant explanations.

AI tutorCertificate
15h1.36k practice Qs
274 credits549 credits50% off
Start free
PEPrompt Engineering Crash Course
FundamentalsAI

Prompt Engineering Crash Course

Prompt engineering MCQ practice, condensed — 306 questions across 34 lessons covering the full syllabus.

AI tutorCertificate
4h306 practice Qs
149 credits249 credits40% off
Start free
Prompt Engineering
FundamentalsAI

Prompt Engineering

Write prompts that actually work — practise the techniques through MCQs with instant, explained answers.

AI tutorCertificate
19h1.71k practice Qs
350 credits699 credits50% off
Start free
Power BI & Data Storytelling
FundamentalsData And Analytics

Power BI & Data Storytelling

Build dashboards people actually act on — practise DAX, data modelling and visual choices through MCQs with instant explanations.

AI tutorCertificate
17h1.5k practice Qs
300 credits599 credits50% off
Start free
How every course works

Active learning — you practise, not just watch.

1Read bite-size lessons

Two-minute concepts. No walls of text, no 40-minute videos.

2Practise as you go

Every concept ends in questions. Instant feedback, always.

3AI tutor explains why

Stuck on a question? Get the reasoning, not just the answer.

4Earn XP and certificates

Keep the streak alive and finish with something to show.

The AI tutor

Never stuck on “why was that wrong?”

Miss a question and the tutor picks apart your reasoning — the concept behind it, the trap you fell into, and one more question to prove you've got it.

Explanations on every question

Not a canned answer key — reasoning tailored to the option you picked.

Weak topics resurface

Anything you fumble comes back later, spaced out, until it sticks.

Progress you can point to

Topic-level mastery, XP, streaks and a certificate at the end.

javascript · closures · q14+25 XP
Practice question

What does typeof null return in JavaScript?

A"null"
B"undefined"
C"object"
Dthrows a TypeError
AI tutor

Close — but typeof null is "object", a bug kept since 1995 for backwards compatibility. Use value === null to test for it.

Verified certificate

Finish a course, earn a certificate worth sharing

Every completed course issues a verifiable certificate with a unique code and QR — ready for LinkedIn, your résumé and recruiters.

SAMPLE
Certificate No. ABK-7F3D9A2Abekus
Certificate
of completion

This is to certify that

John Doe

has successfully completed the course

Data Structures & Algorithms
01 JAN 2026
Scan to verify
Authorized signatory
abekus.ai
Uniquely verifiable

A QR code and certificate number anyone can scan to confirm it’s genuine.

Recruiter-ready

Add it to LinkedIn or your résumé in a click, or share the public link.

Yours on completion

Issued the moment you finish the course — no fees, no waiting.

Questions

Everything else worth knowing

Is Skill Builder free?
Most courses are free to start — you get the full lesson flow and practice questions. A handful of advanced courses unlock with credits, and every learner gets starter credits on sign-up.
Do I need any prior experience?
No. Fundamentals courses assume zero background and build up from the first concept. Each course page shows its prerequisites so you can jump in at the right level.
How is this different from watching tutorials?
You spend most of your time answering questions, not watching. Concepts are two minutes long and immediately followed by practice, with the AI tutor explaining anything you miss.
Do I get a certificate?
Yes — finish a course and you get a shareable certificate along with a topic-level mastery breakdown you can attach to applications.
Can I learn on my phone?
Everything works in the browser on any device, and progress syncs instantly, so you can do a lesson on the bus and practise on a laptop later.

Your first lesson takes two minutes.

Start with any course, keep the streak alive, and let the tutor handle the parts that don't click.

No card needed · 116 courses · Instant feedback