Instructions for LaTeX installation.

First, download the most important part MiKTeX.

Go to

https://miktex.org/download

On this page, click on "All downloads"

Click on "Net Installer" - choose one based on which system you
have 64-bit or 32-bit. The current (2020-10-11) file for 64-bit is

setup-4.1-x64.exe

and for 32-bit system is

setup-4.1.exe

Download the appropriate exe file by clicking on Download. I will
call this file setup-4.1***.exe

The file that you downloaded is a small exe file.

Run the setup-4.1***.exe file that you just downloaded.

It will offer two options: Choose "Download MiKTeX"; then choose
"Complete MiKTeX".

It will ask you for a location you want to download from. Choose
one in US, I was successful with a mirror at UW in Seattle. It will
start downloading. This download is large, more than 1GB.

Just follow MiKTeX suggestions. It will download all the files into
one directory. Just in case, remember where the files have been
downloaded.

Now run setup-4.1***.exe again.

Now choose "Install MiKTeX" and again choose "Complete MiKTeX".

This can take 20 minutes.

Now that you have MiKTeX on your computer. I recommend that you go
through the following steps. (The next instructions are for a
Windows computer.)

Go to Windows "Start" menu. Find MiKTeX in the list of programs.
Click on "MiKTeX console". Go to "Tasks" then click "Check for
updates". Wait patiently. You can see that MiKTeX is working at the
bottom of the MiKTeX console window. When this is finished, go to
"Tasks" then click "Refresh File name database". Wait patiently.
You can see that MiKTeX is working at the bottom of the MiKTeX
window. When this finishes, go to "Tasks" then click "Refresh font
map files". When this finishes, go to "Tasks" then click "Update
package database". Do not worry if it appears that the program is
not responding. It will come back soon.

Again go to Windows "Start" menu and find MiKTeX in the list of
programs and click "TeXworks". Now in TeXworks, open one of the
sample TeX files that I provide or any TeX file that you find.
Next, click the green triangle at the right-top corner below "File"
menu item. This will take a few seconds and it will produce a pdf
file of the TeX file that you are working on. Now look through the
TeX file and find \begin{document}. Below that line is the content
of the file. You can start modifying it with your ideas.

The Internet is a reach source of information on how to use LaTeX.

Here is one website

https://guides.nyu.edu/LaTeX/home

and a small pdf file

https://www.cs.princeton.edu/courses/archive/spr10/cos433/Latex/latex-guide.pdf

to get you started.

The TeX forum at

https://tex.stackexchange.com/questions

is very, very helpful. If you have a problem you can post a clearly
stated question there and you can expect a LaTeX enthusiast from
around the world will answer it sooner than you would expect.

Now you are ready to create beautifully typeset (not only math)
documents.

In closing, a word about different editors that you can use to edit
your LaTeX files. As a part of MiKTeX you have TeXworks as an
editor to edit your LaTeX files. But, there are a lot of LaTeX
editors outthere. Here is a page with many LaTeX editors

https://tex.stackexchange.com/questions/339/latex-editors-ides

It might be a good idea to try other editors. If you find something
that you like better, that might increase your enjoyment of
writing. The editors below are free. I use WinEdt, which is a
shareware $60 (30 day free trial).

I recommend that you try TeXmaker and/or TeXstudio. I did not use
them, just looking at features, I see that they might increase your
productivity.

To download TeXmaker go to

https://www.xm1math.net/texmaker/

To download TeXstudio go to

https://www.texstudio.org/

The End.