Is there a timeline you have for learning this? Are you motivated enough to sit through videos upon videos of lectures followed sometimes by an assignment?
Udemy / Coursera courses are sometimes good. But they’re mostly a hit and a miss.
I learnt whatever I did by diving into a problem. OR, taking an existing problem, sitting down with the documentation and figuring it out. Stack overflow / IRC chats were a good help.
Reading source code from github is another add on.
These give me more comfort with something new rather than a udemy course.