Take an easy solved problem you haven't solve, and instead of looking up the solution you try to figure it out yourself. Starting with unsolved problems is too

Take an easy solved problem you haven't solve, and instead of looking up the solution you try to figure it out yourself. Starting with unsolved problems is too hard in most cases, you need to build up experience with how to tackle the unknown and the best way to do that is to try with known problems that you personally don't know but that you know has a simple solution.