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A lot of books from Flavio - JavaScript, Python, C, Linux, HTML, CSS, Node.js, React, Next.js, PHP. Available online and download pdf/ePUB.

JavaScript for impatient programmers (ES2021 edition)

Code Simplicity: The Fundamentals of Software (Free eBook) » Code Simplicity

About the Book

This book contains the fundamental laws of software design—the most important facts about software development that will let you understand what is going to happen with your software system in the future, based on the actions you take now. It gives you principles that you can think with, that will help you understand why and how to keep your systems maintainable, now and forever.

It is applicable to all software development, in all languages, on all platforms.

460 Free Textbooks – Math, Science, and More [Online PDF for College and High School]

Python Data Science Handbook

The Hitchhiker's Guide to Python