You need more than courses.
You will need tools 🧰.
You will need meters.
You will need a work station 🚉
In a clean room.
A lot of repair is desoldering of asics then soldering them back correctly.
Do you have good eyesight?
It helps to be able to do good close up work.
I can have all of this, i have a good environment and a separated clean space in my farm, its just to know where to start and what to buy and so on