[br2]

Just a beginner too, but I do have one suggestion. Steven Skiena has a series of lectures on YouTube [1] for a course he taught called Programming Challenges. I only just started watching the videos so I don't know how useful they are in the long run but the course itself is all about how to get better at competitive programming. He also has a book called "Programming Challenges" which goes hand in hand with the course material.

[1] https://www.youtube.com/playlist?list=PL07B3F10B48592010