I have just finished the exercises in K&R (80%) of them anyway. I have now started on another book with an algorithmic focus that explains more advanced things, such as how how stack frames and tail-recursion works.
My goal is to one day be working with OS development. I am wondering how to proceed from here, since I have no real C programming experience. Are there any "simple" open source projects on e.g. github that I could join in order to get some experience?