At first clear your basic concepts in any programming language once you get the habit of understanding the logic and creating one learning any programming language would be a piece of cake for you. After that, so for competitive programming this is the best way to test your programming skills and on the same hand increase them. There are many websites like Hackerearth SPOJ which is for biggners. You can learn language online, from books or enroll into any coaching institute for incaap and coursera are your best call.

Hope it helps.

Thank you m