Combinators

Descendant selector: You can use a space to denote a descendant selector. This matches all elements which are descendants of a specified element.
Child selector: Use a greater than symbol (>) to select all elements that are immediate children of a specified element.
Adjacent sibling selector: Use a plus sign (+) to select all elements that are adjacent siblings of a specified element. They must have the same parent and immediately follow this element.
General sibling selector: Use a tilde (~) to select all elements that are siblings of an element.