Object-Oriented Programming

The four pillars — encapsulation, abstraction, inheritance, polymorphism — plus SOLID design. Language-agnostic and interview-critical.

intermediate~25 hours12 topics~21h of lessonsRoadmap Level 1

Every CS skill sits on top of writing and reading code fluently in at least one language.

RECOMMENDED BEFORE THIS
○ Programming with C

These are suggested first. You can still open any topic — this only helps you pick an order.

Prerequisites:Programming with C
Learning Path
07 stages
12 topics · 7 stages0/12 completed
01

Fundamentals

Start from zero. Build the vocabulary.

Classes, Objects and the OOP Mindset~60 minbeginnerEncapsulation~60 minbeginner
02

Core Concepts

The ideas you cannot skip.

Inheritance~60 minintermediatePolymorphism~75 minintermediateAbstraction and Interfaces~60 minintermediate
03

Intermediate

Connect ideas and go deeper.

Association, Aggregation and Composition~60 minintermediateSOLID Principles~90 minintermediateDesign Patterns Overview~90 minintermediate
04

Advanced

Beyond the basics.

Composition vs Inheritance, Advanced Modeling~75 minadvanced
05

Practice

Solve problems until it sticks.

Practice: Design a System~180 minintermediate
06

Projects

Apply everything in real work.

Project: Inventory System~360 minintermediate
07

Interview Prep

Convert knowledge into offers.

OOP Interview Questions~90 minadvanced