Any tips on where to learn Copywriting?

Udemy? Skillshare? YouTube? Where did you learn copywriting? I have no degree in communications.

I'd like to learn how to write good copy, but most courses on sites like Udemy or Skillshare are around 3 hours long. Is there really nothing more to learn about copywriting? Should I just take one of those courses and then practice a ton on writing good copy?

Is it disadvantageous if I am not naturally gifted in terms of writing? Would any experience in sales be benefitial?