MIT Admissions Blog (pretty fun I think!)

mitadmissions.org

The Notorious A2C (but don't get sucked down the distraction hole)

applyingto.college

College Essay Advisors (prompt-by-prompt breakdowns for the Common App and supplements)

collegeessayadvisors.com

Admissions Matters (supposedly comprehensive book that I've never read)

amazon.com

3Blue1Brown Soundtrack (my favorite music for focusing)

vincerubinetti.bandcamp.com