Learn ESX development

Hi guys, i am new to fiveM development, but i learn from youtube and fiveM documentation how to create different resource with the fiveM’s natives.
Now i would like to learn something new and i was wandering how can i learn how to use esx and overextended in my scripts. There are some good tutorials for beginner that i can follow? Thanks

Their docs:

ox
ESX

Thanks for your answer. I have watched them but i was searching something that explain better and do a sort of learning path with some exercise so i can see if i’ve learned well.
I don’t know if I explained myself well