What is the difference between ‘+’ and ‘~’ sibling selectors?.

The General Sibling Selector ~ selects all elements that are siblings of a specified element.

The following example selects all <p> elements that are siblings of <div> elements:

div ~ p {
  background-color: blue;
}

The Adjacent Sibling Selector + selects all elements that are the adjacent siblings of a specified element.

The following example will select all <p> elements that are placed immediately after <div> elements:

div + p {
  background-color: red;
}