21 days of rest including 7 days of camping! Next up is mathematics. Where to begin remains hazy… but that can be figured out tomorrow.
This might be a good starting place. Alternatively, reading Mathematics for the Practical Man could be useful. (It’s what Feynman used to teach himself as a teenager!) There’s also the calculus section of better explained.
The best route forward is likely to choose a goal, (like a problem to solve or equation to deeply understand) and then work toward it. Destinations make paths easier to find.