Various training courses are flying all over the sky, but you should do your homework and find out which training institutions are formal and which are very formal. Some institutions, as long as they pay tuition fees, will not care too much, depending on their training qualifications. I have a basic judgment. Finally, you should study hard. Interior design is not as simple as you think, it is a course about mathematics, design, color, art and so on. It's not as simple as you think, come on!