A simple way to read a map
Maps look dense until you know what to look for. You do not need to understand every symbol; you need a few habits that tell you where you are and what comes next.
Orient it first
Turn the map so the paths on the page point the way the paths on the ground do. Everything else is easier once left on the map is left in front of you.
On a phone, check that the map follows your direction, and carry a paper copy or a saved offline map as a backup for when the signal goes.
Use handrails and ticks
A handrail is a feature that runs alongside your route: a wall, a stream, a ridge. Follow it and you are unlikely to drift off course. A tick is a feature you expect to pass, such as a gate or a stile. Tick them off as you go, and if one is missing, stop and check.
This turns navigation from a worry into a quiet routine.