Spacing is steepness, and the only hard part is valleys against spurs
Spacing
Close together is steep, far apart is gentle. That single rule handles most map reading and is learnable in a minute.
Valleys and spurs
Vs point uphill in a valley and downhill on a spur. Check the numbers on two nearby contours if you cannot tell.
Practising
Look at a hill you know well on a map. Recognition transfers to unfamiliar ground much faster from a place you can picture.
