Because it is evident where the paragraph begins, a first-line indent on the first paragraph of any content is unnecessary. A first-line indent should typically be no smaller than the current point size, otherwise it will be difficult to see. An indented first paragraph is acceptable in some circumstances, such as when the rest of the article is too long to fit on one page.
Many individuals feel that each paragraph in a text should be indented. This is actually superfluous. To mark a new paragraph, use indentation. Given that it is very evident that the first paragraph is a new paragraph, there is no need to indent it at all.
If the paragraph is the first one following a heading, there is no need to indicate that it is a new paragraph; its location makes this clear. As a result, the first paragraph after a header does not need to be indented, and this has been the practice for centuries. Modern editors may choose to leave a gap between the end of the header and the beginning of the first paragraph in order to make the text more easily read.
The width of the column in which the text is located is the key determinant of how far you should indent the first line of a paragraph. Because a fixed indent size might be half the width of the column, the writer must change the indent in proportion to the column width. A common mistake made by new writers is to indent too deeply; they want to make their paragraphs stand out, so they give each line its own box.
The goal of an indented paragraph is to provide a clear separation between different thoughts or ideas. So the amount of indentation should be sufficient to allow for this purpose but not so much that it becomes awkward to read. For example, if you were writing a letter to a friend and wanted to include some details about your life that weren't essential to the main point you were trying to make, you would indent the second paragraph.
By default, first-line indent is used.
If you always want first-line indentation, change the standard style to:
The most frequent approach to indicate the beginning of a new paragraph is with a first-line indent. The other typical method is to leave space between paragraphs. First-line indents and paragraph spacing have the same connection as belts and suspenders. A paragraph with a point size of 12 should have a first-line indent of 12–48 points. A full-width paragraph (one that fills the width of its container) requires a first-line indent of at least 2 points.
If no line spacing is specified, indentation is utilized at the start of a new paragraph. You do not need to indent when using line-space because the space signifies the beginning of a new paragraph. It would be redundant to employ both line spacing and indentation.