Best of all, be a damned good friend to your instructor and take any opportunity you can to return the favor, after all he's doing a favor to you as a stranger to foster your interest in the hobby and investing time in you that could be spent pursuing his own interests, to ensure your success,saving you considerable time and expense.
After all this hobby is every bit as much about friendships and comraderie even more so than it is about flying.
My flying mentor has become and will remain the best friend I have, my planes are his and his are mine and I would'nt have it any other way.
Flying planes has been a life long passion of mine that I had gotten into back in the 80's with nothing but failure and expense as a reward for my best efforts because nobody could be bothered to or wanted to help ya out back in the day.
For that reason alone I am grateful to my buddy for investing his time in me and helping me to realize a life long dream of mine and in the process gained a better friend than any I had known thus far.
He made the comment to me that he had trained a whole bunch of guys, but once they learned to fly he never saw them again as they no longer had need of him and didn't have time to fly with him, well they lost far more than they gained.

If you really want to know how to treat your instructor go try to learn on your own, crash and patch planes till they are too heavy to fly anymore do this for about 2 or 3 years with
less than lousy success and then have somebody offer without you asking them to, teach you the right way to do it, it will be a no brainer for ya.