Good resources about Nim, I've collected for past month while learning and falling in love with it:
Nim-Lang.org - Tutorials on the official website is one of the best ways to learn syntax.

Nim is one of supported languages on Exercism - free and open source platform for coding exercises.
A brief introduction to Nim by Exercism
Nim in 100 seconds by Fireship

Computer Programming with the Nim Programming Language - One of 3 books about Nim and the only free one.
Summary of Nim features and resources. Warning! AI-generated, so don't rely on it too much.
Nim by Example. - Useful for quick syntax overview
Official Curated List of useful packages
Example of making a real program in Nim (brainfuck interpreter)
How to build and deploy static binaries with musl
Nim is not a transpiler