Looking for prerequisite reading material on linguistics/genetics 101

I’ve been lurking in this sub for a while and I’ve seen lots of discussions regarding PIE origins and migration into other regions. It’s been very useful and I’ve picked up a lot of knowledge as a result, but unfortunately I still don’t have the basic building blocks down I feel like; which for this topics is genetics and linguistics.

Instead of relying on what others are reporting about a paper, I’d appreciate if people shared any books or relevant resources which explain genetics and linguistics 101 (I don’t mind textbooks, they’re definitely welcome!) so I can pick up the tools to decipher research myself.