The shortcut key for a manual line break is "Shift + Enter." This key combination is used to insert a line break within a paragraph or a line of text without starting a new paragraph. It is often used when you want to create a line break within a bullet point list, a poem, or a song lyrics, for example.

Explanation:

- The "Shift" key is pressed and held down.
- While holding down the "Shift" key, the "Enter" key is pressed.
- The line break is inserted at the current cursor position.

Benefits of using the shortcut key for manual line break:

1. Efficiency: Using the shortcut key saves time and effort compared to manually inserting line breaks by pressing the "Enter" key multiple times.

2. Formatting: It allows for better control over the formatting of text within a paragraph or a line. Instead of starting a new paragraph, a line break can be used to maintain the continuity of the text.

3. Visual appeal: Manual line breaks can be used to create visually appealing text layouts, such as poems or song lyrics, where line breaks play an important role in the overall presentation.

4. Consistency: By using the shortcut key for manual line breaks, you can ensure that line breaks are consistent throughout your document, maintaining a clean and organized appearance.

5. Editing flexibility: If you need to make changes to your text, using manual line breaks instead of starting new paragraphs can make it easier to rearrange or modify the content without disrupting the overall structure.

In conclusion, the shortcut key "Shift + Enter" is a useful tool for inserting manual line breaks within a paragraph or a line of text. It provides efficiency, control over formatting, visual appeal, consistency, and editing flexibility.