If you don't have a foundation, it is recommended to go to a processing center manufacturer or a local processing shop for an internship for a while, and then go to a training institution to study.

Programming needs to be based on machine tool operation, and tool path, workpiece position and so on cannot be supported by theory alone.

Zero-based learning of programming is already difficult, and five-axis programming is more complicated.

I recommend a study material for you, http://www.skjgzx.org/wenda.

Integrating theory with practice is a good way to learn CNC equipment.