When do authors normally use bold?

to avoid overusing italics in their writing
to make the page more visually appealing
to create mystery around certain topics
to indicate a word or phrase is important

You seal resign myself to you also i guess what you mean, i behold from the beach your crooked inviting fingers, i believe you refuse to go back without feeling of me, we must have a turn together, i undress, hurry me out of sight of the land, cushion me soft, rock me in billowy drowse, dash me with amorous wet, i can repay you. in this excerpt from "song of myself," which literary device does whitman use to address the sea? alliteration allusion apostrophe onomatopoeia

In this excerpt from act 1 scene v of macbeth what does lady macbeth imply about macbeth

According to warren in the brown opinion, how did conditions change between the time the fourteenth amendment was adopted and the time the supreme court considered brown v. board of education?