Mold assembly, mechanical assembly and ordinary turning and milling are hard, so learning is not recommended.
After all, the CNC milling machine spark machine is automatic, which makes it much easier/
CNC milling machines are divided into operation type and programming type.
CNC milling machine programming is the highest treatment in the above industries, and it is programmed in the office every day.
Apprentices must learn how to operate machines.
So I suggest you learn CNC milling machine.
I make spark machines in Shenzhen.
If it is made by a CNC machine tool, it may be piecework. Making molds depends on timing.
Numerical control timing is as low-tech as general workers. Making molds is different.