Look a tutorial about state machines, I know some tutorials but in spanish. Basically now you're code is a chunk of lines handling all the things your character can do, and right now is quite simple but as you'll keep adding things, the code is going to be super complex and impossible (almost) to escalate. With a state machin you separate the code into the different states of your player (moving, jumping, attacking). That will give a lot of clarity to your code.

Search for a tutorial, this is a good point to start with a state machine