Financial planning courses.
Or, how to fund your own retirement account. . .

Seriously, the "Flying" magazine is great subscription.
It has more usable information than many other of the
piloting related periodicals.

However, an AOPA subscription would be great, too.
Note that they cover many topics regarding employment
in their main magazine (I get both AOPA Pilot and AOPA Student
magazines).

Best of luck!