What is a paragraph that takes a single idea and develops is called a what paragraph

If a paragraph has more than one main idea, consider eliminating sentences that relate to the second idea, or split the paragraph into two or more paragraphs, each with only one main idea. Watch our short video on reverse outlining to learn a quick way to test whether your paragraphs are unified. In the following paragraph, the final two sentences branch off into a different topic; so, the revised paragraph eliminates them and concludes with a sentence that reminds the reader of the paragraph’s main idea.

I've actually never heard of the guy. but, atleast he doesn’t rap/sing about drugs and girls, but he still have a very high view of himself, which could possibly cause annoyance