As mentioned, OOTPaddy is great. So is Baseball Dreamland (
https://www.youtube.com/@baseballdreamland) and Old School Sports (
https://www.youtube.com/@oldschoolsports). The guy that runs the Baseball Dreamland channel is an active member on these forums as well.
His "A Framework for Learning OOTP" is a fantastic starting point:
https://www.youtube.com/watch?v=SFr6FqSZ50A