There are many solving methods available that will help you learn the solution of the Rubik's Cube. Most of them fixes the puzzle layer by layer, wathcing out not to mess up the pieces already solved.
Though it looks simple, figuring out how to solve a Rubik’s Cube without any help is far from being an easy task. Even for the inventor of the puzzle needed a month to develop a solving method.
The good news is that there are many solving methods available so you don't have to figure out the solution yourself. It takes practice and patience to learn the algorithms and techniques needed to solve it. Visit CubeSolve.com for the easiest Rubik tutorial, available in many languages.