Add parskip package

Currently the first paragraph in each section is left-justified, but all subsequent paragraphs start with an indent. The default settings for the parskip package gets rid of the paragraph indents, so that all paragraphs are left-justified blocks.

standard.tex

 \documentclass{article}
 
-\usepackage{tabularx, tikz, amsmath, gensymb, titlepic, graphicx, listings, makecell}
+\usepackage{tabularx, tikz, amsmath, gensymb, titlepic, graphicx, listings, makecell, parskip}
 \usepackage[margin=1in]{geometry}
 
 \usetikzlibrary{shapes,arrows,fit}