craftsmanship
Basic skills of art, sketch (perspective of light and shadow ratio, etc.). ), sketch, color. Indoor hand-painted manuscripts are not used much now. The key to use is to express your design ideas to customers better and faster.
theoretical knowledge
Theory, color composition, interior design drawing (emphasis), rendering technique (very useful for hand-drawn presentation), decorative structure, the relationship between decorative materials and perspective (emphasis). Please be familiar with the perspective relationship. Interior design and drawing should at least understand drawings. )
Rendering plug-in
Rendering plug-ins such as 3D MAX, Photoshop, Lightscape and Vray. You need to learn 3D MAX and Photoshop first, and choose 1 for Lightscape and Vray. (3D MAX itself can render the effect, but it's not real enough, but if you are an apprentice, you won't be so demanding at first. )
Internship in an interior design company
If you want to have the road of interior design, there are too many things to learn and a wide range of knowledge requirements. The above is aimed at beginners. Want to continue, need to accumulate. Structure, geomantic omen, budget quotation, etc. But there is also a saying that after working in an interior design company for a few years, you can go out and open your own shop.