I want to become a good programmer. I'm in class 11th. What i have to do after that to become expert in this???

Answer 1

Code a lot of different things, easy and hard, when you can't do something, search on the web and learn to do it. It's my favorite way to learn things I never heard and coding good apps

Answer 2

read some books and PRACTICE.
it is really important to practice if you want to master something.
Go on the web and participate in programming competition it is a good thing to do to train yourself to work in a limited time.