Soil moisture is tied to the climate of the area where you live, but even in a small yard, there can be wide variations.
If your garden is at the bottom of a hill, the soil may remain wet for long periods of time.
In this situation, you can try creating a raised bed as mentioned above, but it is best to stick to plants that enjoy having their feet wet.
Alternatively, if your plot is very dry, don’t assume you will be able to compensate by frequent watering. Select plants that will be happy in a dry place instead.