I'm writing a Cheatsheet with a lot of formulas and having paragraphs indent is just wasting space and doesn't look good at all, so I want to disable autoindentation. But sometimes I still want indentation in some cases (which aren't rare, but still rarer than I would type \noindent without any changes).
So far I've found this question, which in both answers says to use
\setlength{\parindent}{0pt}
But this prevents me from using \indent when I want it. So the actual questions would be. Is there a way for latex to default to \noindent and then use \indent when necessary?
Edit: I'd also like to add that I'm still very new to typesetting, so if what I'm asking for is bad practice, please let me know, and if possible, why.
\indentuse\hspace*{20pt}(no space after it. – egreg Jun 24 '17 at 20:41parskippackage, which sets\arindentto 0pt AND adds some vertical skip between paragraphs, taking care of the vertical spacing in lists. – Bernard Jun 24 '17 at 20:45