Khan Academy
Free classes on any subject.
1. Always free
Non-profit funded. App or khanacademy.org. Sign up optional.
2. Math
From basic arithmetic to calculus. Helpful if you're tutoring grandkids.
3. History
World history, US history, art history. Hours of free video lessons.
4. Personal finance
Stocks, retirement, mortgages explained in plain language. Great refresher.
5. Computer basics
How computers work. Internet history. Plain-English lessons.
6. Khanmigo AI
$4/month. AI tutor that answers questions. Excellent for learning new topics.
Each video is 5-15 minutes. Easy to fit one or two into your day.