Coursera and edX
Real Harvard, MIT, Stanford classes.
1. Free to audit
Most courses free if you skip the certificate. Watch all videos, do all homework.
2. Famous universities
Yale, Princeton, Duke. Same content their students get.
3. Pace yourself
Most are 4-12 weeks. 3-5 hours per week. Pause and resume anytime.
4. Senior favorites
Buddhism in the Modern World, Astronomy, History of Rock and Roll.
5. Captions
Every video has captions. Speed adjustable too.
6. Certificates
Optional. $30-100 per course. Good for resume or a diploma on the wall.
Many libraries offer free Coursera Plus. Ask at your branch.