Move

The Move Stat determines how far the unit can move each turn. Each Move allows 1-tile movement. There are some special terrains that either impede or assist movement.

Movement-impeding terrain
Climbing up a mountain consumes 2 Move instead of 1. However, if a unit has 1 Move, it can still climb the mountain. 2-move units can climb up but but can't climb down. (climbing down only consumes 1 Move). Climbing is required to move in this terain

Enemy's units have a secret aura of 1-tile surounding them. Moving into that aura instantly consumes all remaining Move of the unit. (moving out of that aura only consumes 1 move). This means that your unit must move all the way around to sneak through an enemy's unit.

Movement-assitsting terrain
Moving on a Road consumes 0,5 move. However, 0,5-move units can't move any tile, thus rendering 1 road useless.

Your cities are treated as roads by default.

Flying
Flying units are not affected by any terrain, all tiles consume 1 Move and will always be available regardless of researches. However, enemy's aura will still affect flying units

Flying units themselves also have no aura, allowing enemies to sneak under them easily

Water and Ocean
Land units can't move in these tiles and must use boats. Special naval-specialized units like Admiral have stronger boat. Water and bombers is required for water tiles, Ocean and admirals is required for ocean tiles