""23 things I didn't learn in college / grad school":

#11: Be generous with your time

.

Especially with your colleagues, students, friends, members of your professional community:

as a resource for help with technical problems;

as a sounding board for ideas / career topics;

as a source of bits of wisdom;

even as a target to rant a little about the world

...but especially for technical / professional matters and work-related semi-technical matters

Not because, in some woo-woo sense, it makes you feel good -- which it certainly does.

Nor because it's a transaction and the other person might help you one day -- which they possibly might.

But because it is a good opportunity to learn.

When you help, you reinforce a skill/concept for yourself, you learn what makes it hard and how to explain it better.

When you brainstorm, you absorb new ways of thinking about things.

When you listen, you internalize what behaviors cause distress so you can avoid them.

When you generously give your time for 1:1 conversations or small-group discussions, what you learn is worth several multiples of the time you invested.