Who's standard are you referring to? Pop/Rock/Folk/Blues/Gospel/RB all have a commonality of progression based music. Something which is rare in classical music.
But I used him as an example because he didn't have thorough knowledge of music theory in a 'standard' sense.
He did sit down and study several hours a day for years. Read the link. He would watch shows constantly practice and take tips from other musicians. He knew how to play progressions because he studied them in songs he knew how to play over progressions because he studied them. He copped phrasing from other players and applied them.He didn't squirrel away for years studying music and, I'm speculating but I would be willing to bet that, he wrote, played and composed more from instinct than from intellect or analysis.
About Practice
Something not amazing but common happens when you play with others who are good and study alone....you get better.
Sure Jimi had some talent. But he developed his skills they didn't fall from the sky.
Practice is serious biz if you take it that way.
Steve Vai practiced 12 hours a day.
Yngwie Malmsteen practiced 8 hours a day.
You want to be good or do you just wanna fk around?
Wishing with a little bit of natural talent does not greatness make.
Nature and nurture walk hand in hand. One finds the tools and makes the most of them. If it means sitting down and transcribing the works of others then one does it. If it means talking advice from other musicians one does it. If it means trying to cop the feel of a favored player one does it.
Back to Jimi
He started young and got to work out his ideas early but fame didn't happen for a long time because he didn't have his act together.
Once again read the link.
He did have uke experience before playing the guitar. Picked up the guitar at 15 and Didn't write his first major song till 8 years later. He had plenty of time to develop his writing skills and plenty of resources to draw from.
Any magic he had was due to hard work, embracing concepts that were not his own in origin (because he backed other song writers on the chitlin circut) and applying the same concepts found in popular music (blues, r&b, soul, rock, folk)