You use the elements h1-h6 or uses there classes any apply on any other text element h1, h2, h3, h4, h5, h6

This is heading 1

This is heading 2

This is heading 3

This is heading 4

This is heading 5

This is heading 6

Short line

Display

You display classes for bigger text without giving semantic meaning display-1, display-2, display-3, display-4, display-5, display-6

Display 1

Display 2

Display 3

Display 4

Display 5

Display 6

gradient effect