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The best guided project/intro I've seen for complete beginners is Daniel Holden's "Build Your Own Lisp". It's a free online book that walks you through writing a Lisp interpreter (something worthwhile even for experienced C programmers!):

http://www.buildyourownlisp.com/

Creating a small UFS implementation (on top of your file system, rather than as a raw disk is probably easier) in C is a nice fun exercise.

Thanks for the recommendation ! Sounds indeed like a fun thing to do.

A small kernel.

I think it’s always good to start with implementing data structure and algorithms...

If you want C++, try help out Firefox’s codebase. I did and it was a very rewarding experience. (Linux kernel project is hmm... just harder to get involved IMO).

Ha ! Yeah I'm not competent enough yet to start this kind of project. It does seem really fun though

Yeah... the suggestions here are all pretty cool but not for beginners.

I‘d suggest a simple Sudoku solver as a beginner project :)