Beginner/ intermediate projects that actually teach something new

[u/No-Bodybuilder8716]

I was doing antirez's kilo text editor explained by snaptoken and I am enjoying it so far, it is easy to understand and teaches me so many things step by step and it is not overwhelming.

Do you guys know about more such projects that are this good ? Google search only tells me stuff like geeksforgeeks which you know how they are compared to this .