Handbook
Handbook — Quick reference guide for developers and engineers, filled with concepts, cheat sheets, and practices for tools and technologies.
Concepts Detailed explanation of core concepts
Design Collection of Design principles for Low-level, High-level, API, database, patterns etc.
Languages Quick reference handbook for programming languages like python, java, golang, bash, SQL etc.
Tools Quick use tool reference for day to day used tools such as CLI tools, other developer tools etc.