SOLID

Lesson in the Software Architect Roadmap · Stage 6: Patterns & Design Principles

Last updated 14 September 2026

What is SOLID?

SOLID is a set of five object oriented design principles: single responsibility, open closed, Liskov substitution, interface segregation, and dependency inversion. Following these principles leads to code that is easier to extend, test, and maintain as a system grows. Architects use SOLID as a checklist when reviewing designs for long term maintainability.

Study this in the interactive course See the whole Software Architect roadmap

Free resources to learn SOLID

ArticleSOLID Principles
ArticleSOLID: The First 5 Principles of Object Oriented Design

SOLID: common questions

Can I learn SOLID in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain SOLID in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this SOLID tutorial for beginners?

It is lesson 34 of 112 in the free Software Architect roadmap, in stage 6, Patterns & Design Principles. If you are new to Software Architect, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.