Sometimes a paragraph starts with an indentation (which could be turned off with
\noindent) but sometimes it does not.
For example, I have currently an
article where the section content is not indented, the text after
\newline is not indented, but the text after a blank line is indented.
I'd like to understand when an indent is added to the start of a paragraph by default (and perhaps also what commonly used things might inadvertently change that behaviour)
I found: The first paragraph of the section content is not indented by default but the others are.