When coding a block element, the tag always starts on it's own line, examples are tags for headings, paragraphs, and lists. Inline elements start in a line, naturally. You'll add them as you add your text, like tags for emphasis, italics, bold etc.

A close up shot of a red rose in bloom
A close up shot of a red rose.
A close up shot of a sunflower and the blue sky as a backdrop
A close up shot of a sunflower and the blue sky as a backdrop.