\documentclass[letterpaper, 11pt]{article}
\usepackage{fullpage}

%\usepackage{indentfirst} % indent the first paragraph like the others

\title{Paragraphs}
\author{Clif Presser }
\date{January 2020}

\setlength{\parindent}{0em} %set the indent to 0*the size of an m
    % you could set it to 10mm (millimeters)
    % or .5in (inches)
\setlength{\parskip}{1em} % set the space between paragraphs

\begin{document}

\maketitle

\section{Introduction}

Sometimes you want paragraphs to show up with spacing that is not default. For instance you may want to change the indentation and space between paragraphs.

Well, look no further. All that is possible by setting a couple of values in the header of the document.

\end{document}
