Seven topics: design-pattern fundamentals including code quality and the SOLID principles, then Singleton, Factory and Factory Method, Abstract Factory, Builder, and Prototype — each split into basics, implementation, and the tradeoffs that decide whether you should use it. A closing mastery topic compares the patterns against each other and asks which one a given situation actually calls for, which is how interviews test them.

Developers preparing for design rounds, and anyone who has read the pattern names but could not defend a choice between Factory and Builder under questioning. It assumes you are comfortable with classes, interfaces, and inheritance in at least one object-oriented language. It does not assume you have used any pattern deliberately before.

The course is organised as topics, subtopics, and individual lessons. Each lesson pairs a short set of explanation cards with practice questions written for that lesson, so the questions test the idea you just read rather than a general survey. Wrong answers come with a worked explanation, and the AI guide surfaces the mistakes you keep repeating.