Answer:
The theme can honestly be more than one. I will give you a few examples.
Practice makes perfect
Always know not everything is what it seems.
Explanation:
"Sometimes he would stay after school just to watch the older boys do tricks on the stairs."
"As Tommy put his first food on the skateboard, the skateboard slid out from under him and he fell on his butt."
These two prove that you have to practice to get good at it and even though other people can do it. It does not mean that you can do it on the first try.
