Leaves in the garden act as a kind of compost. In addition to improving the soil, leaves also have a protective effect: the leaf layer provides soil protection. If you rake everything away, the soil dries out because of the sun that can shine on it unhindered.
The lawn does need light and air. So if there are leaves on the lawn, you can get rid of them. You probably want the paths to be free of leaves as well. But whatever you do with your leaves. Never use a leaf blower.
Wondering why you should never use a leaf blower? Then click on the next page!