Jack Bogle, who transformed investing for millions of people by teaching us the virtues of low cost index mutual funds. At least read his five rules of investing.
Five investing rules: https://www.nytimes.com/2019/0...
About Bogle: https://www.nytimes.com/2019/0...
Obituary: https://www.nytimes.com/2019/0...

A great podcast about why it is good to quit, with some terrific examples:
Dubner, S. J. (2011, September 30). The upside of quitting [Podcast]. Freakonomics Radio.

Video on "The Craft of Writing Effectively" from Larry McEnerney (thanks to Andrew Hanson):
https://twitter.com/ADHansonLab/status/1081653967938113539

Living abroad is good for your career and enjoyable:
Gewin, V. (2018, November 26). Why you should move country.Nature.

One of many resources for developing and revisiting your career plan:
My IDP from Science magazine: https://myidp.sciencecareers.org.

Research experiences for undergraduates listed on Plantae: 
https://plantae.org/careers/internships/