This guy. https://en.wikipedia.org/wiki/David_Hahn
HumanPerson
Personally I'd recommend just going for it on your daily for most of the stuff you mentioned. Just learn enough before you start to understand the various ways to fuck up, and manage risk accordingly. Helping with friends' cars can also be a good way to learn if you have friends that do that. For specific recommendations, old Hondas and Toyotas are great, like other people are saying. However old (and new although less so) Honda automatics kinda suck so I'd either avoid their autos or look into trying a manual swap. If you get one with lower miles on the transmission it will make it a while.
There aren't many cheap Miatas anymore though. Maybe it's different elsewhere but where I am the old ones are expensive because they're old and the newer ones are expensive because they're new. There's a bit of a middle ground but those still aren't that cheap.
Plus TiB are based on powers of two instead of ten which makes more sense for computers. It's not really a practical difference (2 vs 10, not the size difference which is significant) a lot of the time but I personally find powers of two more pleasing.
My friend and I got an old optiplex and upgraded it with a burner so we can make CDs. It's actually quite nice to have a physical medium for music in the car, and make mixes for different moods that you can switch between. We also know some people with older cars that only have CD and radio or the Bluetooth sucks so we'll make CDs for them too. Tons of fun and you can buy a usb CD / DVD burner for like $10 or $15 and CD-Rs are fairly cheap.
Fourthed and fifthed since we're doing two now I guess.
Anything helps, totally acceptable. My network is shared with others, I limit my speed up and down to make sure I don't slow it down for everyone.
Are they no longer lithium ion? Seriously asking.
Please tag this as nsfw
It could have the benefit of being usable for longer as batteries degrade, especially if you can cap the charging to 80% or something to slow down wear.
The effect is cumulative, you'll do better if you quit than if you don't, but some damage has been done. It's a "the best time to plant a tree was 30 years ago, the second best time is today" situation.