if OP is interested in learning fast in a structured way there is UBI
https://bikeschool.com/
also some areas offer park tool school
https://www.parktool.com/park-tool-school
I got back into bikes and wrenching on my own some years back. I had basics bike skills (pack a bearing, adjust brakes and deraillers) but learned a ton more by doing, looking things up and getting input from Bike Forums. Learned more helping at a bike charity and working on neighbors bikes..... especially what a BSO is and how great thumshifters are for simple bikes
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)