The Haynes manual for your car. Even if you’re not a mechanic they are so detailed they will walk you through fixing almost anything, they’re made for the laymen. I’m a diesel mechanic and even i own one for my cars.
When friends buy a new car i buy them a Haynes manual.
They don’t do them for ever single car in the world and the coverage isn’t as great on later model stuff but if you own s car 5 years or more old they’re great.
I used to have a blackberry, it was awesome. Right before touch screen really hit, had a track ball that would get dirty. Beyond that it was the best phone i had. When from that to a s3 then s7 then s9 and now s21.
One thing i noticed is i had to buy a buy a new phone more and more frequently. I went through two s9s and my s21 is so bad i need a new phone but hate the idea.