Work out what your strengths, weaknesses and capabilities are. train your weaknesses, maintain your strengths, and expand your capabilities. once you are confident in your sense of balance, strength, and general knowledge, try to find someone who will demonstrate said parkour moves (this could easily be done by video, if you can't meet anyone who can help you). half of the move is knowing how to move, son pay attention. Once you've done that, you're done
The best way to learn simple parkour moves is to practice with a friend. It can also be helpful if you visualize how to perform a move prior to the move. You can also get a parkour coach to help you in making the moves correctly.