Prompt and heartfelt attribution of contributions + thanks/praise that helped you get your work done in public or to the donor's manager. Tacit feedback to the person in private as necessary.

Even as the greatest developer, in most settings you have to work with people. You can get very little done all alone nowadays - The basics of making people feel appreciated takes you really far.

I am not very socially adept - so this was a revelation for me when I stumbled on it after years of 'reward for good work is more work' philosophy.