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Obviously this is region specific, but slowing down water is one of the best ways to have fresh water.

Slow it down from trickling down a slope and you have two things: more vegetation (which also retains water) and more time for that water to penetrate the ground for local wells.

You can completely "terraform" a desertic region https://youtube.com/shorts/cfhbtgon4Nk?is=oAExB5UeMAsShBux

Geography and prevailing winds have conspired to make certain regions devoid of rain, even many that are right next to the ocean. Competition over resources like water are behind a lot of human misery. The more potential solutions for obtaining fresh water, the better.

Let’s grab a giant pole and catch clouds. I wonder how much liter of water a giant cloud is. I also wonder what a good unit would be for a cloud. Small, medium and large is all I have

Well, sometimes it doesn't rain and (at least for coast regions) being able to desalinate can be of critical importance.