What are some good beginner-level tinkering projects to do at home?

I’ve been getting into tinkering with video game cartridges to replace the battery and I realized that I really want to do more stuff like this. Things with radios and television sets, etc. etc. I’ve recently learned to solder when I fixed my video game cartridge. I want to do more stuff with that but I’m at a loss on what else I could do for good practice.

My mom has an old CRT TV that recently crapped out. I’m thinking of opening it up just for shits and giggles and possibly even trying to fix it? I really want to do things with radios too. That would be cool.