ADVISE FOR STUDENTS
Probably the most complete source for undergraduate and graduate students with advise on how to write, learn, or study can be found in the website of Mexican professor Raul Pacheco-Vega from FLACSO-Mexico. You won't regret going to that link.
On how to take notes and learn how to critically engage with your readings, I also recommend this resource by Prof. John McMahon from Hunter College.
On literature reviews. Although less thorough that Pacheco-Vega's website, USC provides also useful resources that explain what is a literature review and how to write one.
Below you will find important advice on how to contact professors through email: