When writing a body text or paragraph, it's good practice to start a new line only for paragraphs, section headings, or intentionally for stylistic reasons. Using a single space after a period is commonly accepted as the way to separate sentences.
However, there are certain cases where starting a sentence on a new line can be appropriate:
- When starting a new paragraph or section.
- For emphasis: Beginning a sentence on a new line can add emphasis or draw attention to that specific sentence.
- In poetry or creative writing: Line breaks can be used intentionally in poetry or other literary forms to create visual effects, poetic rhythm, or to enhance the meaning.
- In scripts, plays, or dialogues: New lines indicate changes in speakers or the start of a new scene in scripts and plays.
Ultimately, the decision of when to start a sentence on a new line is a matter of style, readability, and the overall structure of the text. In most cases, it's best to use line breaks sparingly and start a new sentence after the appropriate punctuation mark.