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About watering, my father thought me, after transplanting, make a hole about 10 cm away from the roots of the plants and water the plants through that hole. This way the soil won't become muddy around the plants and they can breathe.

I use the water to settle the soil (instead of tamping). Just have to make sure the soil isn't already waterlogged. If it is, I just add some non-water-logged soil along with it. But generally I keep my garden beds mulched unless I'm heating up the soil, so they're rarely overly wet.