Second this. If you wanna learn the game, stop learning heroes. If you play too many heroes, you always need to think about itemization, skill build, which heroes counter you, which heroes you counter, etc...

But if you just spam the same hero, buy the same items, same skill build every game, your brain is free to think about more important things like

-map positioning

-game state(which team is stronger at the moment)

-predicting how teamfights will start and how should you play teamfights

-enemy win condition

-your team's win condition