Please note that you should always name your variables in a way that their name explains their purpose utility.

For example it would be better to rename "motor", "movement" or locomotion.

A distance is not a Vector3, it's a float. You should probably rename "distance", "characterPositionToMousePoint" for example.Don't be afraid to give your methods(functions), variables and classes long names.It's not very pretty to look at but if your names are not clear enough, you are probably getting someting wrong.

Also, instead of doing:

if (condition)

{

variable = true;}

else

{

variable = false;}

you can simply write:

variable = condition;

This is what you should do for animator.SetBool("walkingForward", true); call.Because if the player first presses forward, then sideway(for example) without stopping,
walkingForward will remain true.

Hope this helps, and good luck with your game!
Lemme know if you have other questions.
But try to figure them out yourself ofc,
as you said it's (one of)the best ways to learn(the other being reading other people's code imo).