LaTeX is used to create PDF documents with complex mathematical notation.

Engine:
MiKTeX - https://miktex.org/download

Editor:
TeXstudio - https://www.texstudio.org/

https://overleaf.com/learn

Options->Configure TeXstudio…->Build->PDF Viewer->External PDF Viewer.

Options->Configure TeXstudio…->Commands->External PDF Viewer. Set Sumatra PDF path.

Install cm-super package in MiKTeX Console.

Document structure:

\documentclass[a4paper, 12pt]{article}
\usepackage[margin = 1in]{geometry}
\usepackage{parskip}
\usepackage[T2A]{fontenc}
\usepackage[english, russian]{babel}
\usepackage{amsmath, amssymb, mathtools}
\usepackage{tikz}
\usepackage{graphicx}
\usepackage{hyperref}
\hypersetup{colorlinks = true}

\begin{document}
	\sloppy
	
	Hello, World!
\end{document}