LATEX Course
LaTeX
You can use LaTeX to easily write documents such as reports, presentations, or even resumes. This is also quite convenient to write math inside a document or a website.
In this course, you will learn
 how to write a basic latex document
 how to write math in latex
Introduction
You may code latex (.tex
) documents on

Overleaf (previously
writelatex.com
), a simple and collaborative tool, you need to register  CoCalc, the UI may be a bit hard to use but no account is required
You can also use a latex compiler on your machine, but that's not covered for now.
There are a lot of latex templates, so be sure to check them before starting a document from scratch https://www.overleaf.com/latex/templates since there are presentation templates, CV/resumes templates, report templates...
Writing documents
Generally, latex documents look like
\documentclass{article}
% your packages
\usepackage[utf8]{inputenc}
\begin{document}
your content here
\end{document}
Each time, you would want to use some tags for your content, you will have to use a directive starting with \begin{directive}
and ending with \end{directive}
.
Writing math in latex
First and foremost, you should check out this awesome website http://atomurl.net/math/.
A math equation needs to be put inside

$latex$
(or\(latex\)
): inline math, meaning inside a sentence 
\[latex\]
: the formula will be rendered on a whole line.
An alternative to \[latex\]
is \begin{equation}latex\end{equation}
.
Spaces are useless in your latex code since the math parser will do whatever he wants, you should either use \
(backslash followed by a space) or use \quad
(or \,
, \:
, ...). You can make a horizontal space with \hspace{1cm}
.
Note: if you don't remember the name of a symbol, just draw it on detexify and ask him to look for it.
Related
 Alternatives to atomurl
 Mathjax reference (math renderer in JS)
 New lines in mathjax
 Strikeout in latex
 katex
Cheatsheet
Because I'm enjoying adding links to cheat sheets, here are some sheets that look good
 symbols.pdf
 latexcheatsheet.pdf, latexcheatsheet.pdf (french), video.
 Wikibooks  latex
 math guide for latex
Sources
 https://www.overleaf.com/
 https://www.overleaf.com/learn
 https://fr.overleaf.com/learn/latex/Code_Highlighting_with_minted
 https://fr.wikibooks.org/wiki/LaTeX/%C3%89crire_des_math%C3%A9matiques
 https://www.commentcamarche.net/contents/620latextabledecaracteres
 https://www.xm1math.net/doculatex/espacements.html
 https://fr.wikipedia.org/wiki/Aide:Formules_TeX
 https://oeis.org/wiki/List_of_LaTeX_mathematical_symbols
 https://en.wikipedia.org/wiki/Wikipedia:LaTeX_symbols