Looking for beginner hardware projects

As I study for CompTIA A+ and start my home lab journey, I’ve been looking into software mainly, and wanted to see if there were some beginner projects/things I can do to learn more about hardware.

Specifically, I have access to:

• numerous iPhones I don’t mind fucking up
• an old mechanical keyboard
• a laptop that I don’t want to fuck up, but it’s performance isn’t great, so maybe some easy upgrades? Also the keyboard doesn’t fully work, so repairing it maybe?

I also have my main PC but don’t really want to touch that until I’m more knowledgeable, unless it’s super easy stuff. I know some of PC building is almost LEGO-like, just take the piece out you don’t want and replace it with the part you do. But I have zero experience with touching any modules.

What are some “Baby’s First Hardware Project” ideas that I could do with this stuff that will teach me something relevant to A+?