Actually, the title is somewhat misleading. For once, the original (Rubik) is one of the worst product to buy. Much better cubes are available, much more enjoyable and easier to play with. See "My cubes" below.
The Jperm approach works really well:
COMMON TOP LAYER PROBLEMS Step 4. If you can only get 1 or 3 edge pieces of the top cross, you need to reassemble the cube as solved. Step 5. There should be no problems here. Step 6. If you ever get only 2 corners in the correct location, you need to reassemble the cube as solved. Step 7. Finish the 4 moves (don't stop at 3) every time. Turn the bottom (don't rotate the whole cube) to get the next piece. If it STILL does not work, you need to reassemble the cube as solved.
Recommended Youtube channel: https://www.youtube.com/JPerm
Starting with this video:
Valk 3 Elite M by QiYi
The Valk is a new speedcube designed by QiYi with the influence of Mats Valk.