jimmy hendrix never knew how to strum guitar, and there was no youtube then, how did he learn on his own???

Some acquire their skill with relative ease!!

Jimi sold his Soul to the Devil at the crossroads like all blues guitarists do 😎 No sense sitting around all day trying to learn 12 Bar Blues when you can just go to the crossroads at Midnight and strike a Deal 🎵

There was no YouTube when I first learned either. Mostly I listened to records and learned to play along, with a few books to help along the way.

Lots of people learned on their own back there.. it was a time where enthusiasm and natural talent counted for more.