Developer training

Hello everyone,
for some time I try to learn development all by myself with all possible help on this forum but in the end I think I do DIY.
I wish to do my job so I would like to do a real training.
I think to start with javascript what do you think?
What do you think of UDEMY training?
would you have any other tips?
To know that for now I have another work day that I would stop when I could move in the dev.

Thank you in advance.