There are 4 things I would really like to learn and do on my own....
1. How to clean and lube the chain on my bike effectively and efficiently.
2. How to change oil and filter on my bike.
3. How to winterize my bike and store it properly.
4. How to get my bike started properly at the start of summer.
Just the absolutely basic maintenance a bike needs year after year.
I'd be happy knowing just these things. Anything more than that I would rather take it to a mechanic.
Pay me $50 and I'll show you
$50 for someone to come over to your place and teach you these procedures on your bike is a bargain.