What are all the best courses to be learnt, that helpful for future?

It depends on what country you are in, and a little on your level. In the USA you need a real civics class, and maybe another one. You need to learn a bit of acting with emphasis on vocal skills such as public speaking, story telling, drama, or any vocal performance. You need a course in personal money management. These are all things that every citizen needs and they are not taught in high school. And to be successful you need to learn how to make friends. I have not discovered any such class.