To learn interior design, you should go to Kaixiang Decoration Design Training School, which is more professional and systematic.

If you don't have optical software, you still have to learn to draw.

There are many places to learn software, but what's the use of just talking about commands? It is best to look at the help file of the software. Anyway, it's all Chinese software now

I suggest you go to Kaixiang, not only to talk about software, but also to talk about how to draw pictures, where to divide them very carefully, how to make sun scenes, how to make night scenes, how to show Chinese style and how to show modern style.