Easiest way to make space between a Widget and something else on the page is by using the 'Margin' button when you go on top of a widget.
By clicking on it a Margin Mode activates that allows you with simple mouse hold and moving around to make margins on top or left from the Widget.
An other way to create space between widgets is by putting 'Spacer' Widget. It's an empty space widget used for making spaces. You can see it in almost all themes as dashed light gray empty space.
You can easily arrange your content and widgets by using the container columns. They are adjustable and up to 5 per container. Great for all kinds of grid contents.