Press F3 on Java Edition or enable Coordinates in world settings on Bedrock Edition
Read the three coordinates as X, Y, Z
X = east/west position
Y = height level
Z = north/south position
Positive X = east
Negative X = west
Positive Z = south
Negative Z = north
Higher Y = higher elevation
Lower Y = deeper underground
Use the coordinates to find your location on the map
Compare your coordinates to a target location to move in the right direction