How to re-learn C?
Hey guys, I'm a graduate now. Just completed my B.Tech in CSE. Had a c language course in my first semester. I always liked c but couldn't move out of dsa and see how it is used in daily life. Then I later got to know there are complete operating systems running on just c. I later got curious and wanted to read the code and contribute to it. But the major issue is it feels like a xomplete different world when compared to the c I was introduced to. So wanted to ask the community, How to re-learn C?
Please suggest books or lectures or tutorials that let me understand the c we use to build things.
Thanks in advance.