Also, in terms of “slips” when you are not trying to land…
If you want to go from point A to point B in a crosswind, you will be pointing into the wind in order to maintain heading to your destination, so you will be flying “sideways” relative” to the ground.
It reduces your net speed over the ground, which increases your fuel consumption for a given flight, but otherwise crosswinds are only a major problem when you try to land.
Hat, coat, door…