To be honest, there are some difficulties. After all, it is a game, which is a little different from an application. But at least there is no grammatical difference. Getting started takes some time and a lot of knowledge. But it doesn't mean that a job that just started needs so much knowledge from you. There is really little information. I suggest you look at the document. Unity3D Scripture (Baidu) has many Chinese versions translated by many people. Look at the user manual and reference manual, and many things will be known after getting started. As for other knowledge, it is very important that besides what you said, there is 3D mathematics (mainly covering advanced mathematics, linear algebra, etc.). There is nothing wrong with learning this knowledge while working.