The water cycle can happen anywhere but it begins in the ocean, where all earth's water are.
The sun heats up the water
Some of the water evaporate into something called vapor. Then the air takes the vapor and the water that comes from evapotranspiration up to the atmosphere.
Evaporate = Liquid turns into gas (ex. heating) Evapotranspiration = Water evaporated from plants and the soil.
While traveling up to the atmosphere. It is hit by the colder temperature and this cause the vapor to condense into clouds.
Condense (condensation) = Gas turns into liquid (the water vapor in the atmosphere becomes liquid water).
Precipitation = snow, rain, hail. Some can also collect as ice caps ang glaciers.
The air moves the clouds all over the world, until the particles inside the clouds hits and grow even bigger. At the end it falls out of the sky as precipitation.
As the precipitation falls down, most of it falls down overland due to gravity and this is called surface runoff and it mostly float back into the ocean. And the cycle start again.
But a part of the runoff also soaks into the ground and this is called infiltration. The water infiltrate into the ground were it can ex. be stored as fresh water for a long time. Some of ths water can later on become ground water.