You don't need a special foundation, and it doesn't matter whether you have studied AutoCAD or not (preferably not), but you need a strong spatial imagination. It is suggested to deepen mechanical drawing and descriptive geometry.

It is not recommended that you draw according to the script, which is very inefficient, especially if you teach yourself, it is easy to hit your self-confidence.

I suggest you find some videos on the internet to learn, and go to Catia module of CAD professional forum to see more.

Don't expect to master it in a month or two. I suggest you settle down first and try to study for at least half a year without a job. (Of course, it is impossible to master. If you want to master it, go to a professional design company for one or two years after graduation. )

I suggest you find 3D entities to import Catia first, and then take photos and think more.

Come on! ! !