How do you typically help other engineers who come to you for help?

I am studying the ways in which software engineers mentor or assist others. As any good mentor knows, the help that you provide can take many forms and some are more effective than others, but reality in a software engineering job also sometimes dictates results. What is a recent tactic you used, or situation you commonly find yourself in? Do you always send them the code, or always fix it yourself and explain later? Maybe find another tool that solves it?