LaTeX

Please go to https://www.latex-project.org/get/ to find the LaTeX distribution for your operating system. If you can, you should try to install the “full” version of TeX, but it is a very large install. The upside of installing everything is usually you’ll never have a problem in the future with loading TeX or LaTeX packages.

There’s also a very good LaTeX IDE called TeXstudio: https://www.texstudio.org/. It’s a fork of Texmaker (http://www.xm1math.net/texmaker/), but I find that TeXstudio has better autocompletes. You can try both of them, they’re pretty much the same (in both function and visuals)