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/Triangu...
How to draw a cross section:    • Cross section mapwork / mapping  
Full mapwork playlist:    • Geography mapwork / mapping