Geography mapwork skills: How to read a Contour / Topographic map. If you understand the basics of relief features on topo maps such as contour lines, contour interval, trig station/beacon, spot heights, etc., you will find it a lot easier to interpret topo maps.
Trig station/beacon link: https://en.wikipedia.org/wiki/Triangulation_station
How to draw a cross section:
https://www.youtube.com/watch?v=9w-KOodmiZc&t=17s
Full mapwork playlist: https://www.youtube.com/playlist?list=PLt71K0lJFEluBHCxlYv2tbtAqUSIKZSM8