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Sorry for this silly question, but why does LaTeX indent the very beginning paragraph?
\documentclass{article}
\begin{document}
\begin{abstract}
Here \LaTeX{} indents this paragraph.
\end{abstract}
It does this one too. \LaTeX{} does not indent first paragraphs, but why these two?
\section{TEXT}
This one is not indented as usual.
\end{document}
What is the internal LaTeX standard?
Paragraph indentation is suppressed after section headings and not anywhere else by default. Some document class may define abstract to suppress indentation some may not, it is a choice of that class author. LaTeX itself (in the format) does not define an abstract environment at all so there can be no built in default here.
\noident. Also you can change\parindenteverywhere (e.g.\setlength\parindent{0pt}foo\par\setlength\parindent{1em}...). As the answer pointed\parindentcan be modified by document class, but also by packages (parskip,babel) but you actually showed the "standard" of the standardarticle: indent always except after a header, ... or aitemizelist not ended by blank line (or anenumeratelist, but not in a rawlistenvironment). – Fran Jun 28 '19 at 9:22