LaTeX is a typesetting language which is especially useful for making mathematical writing look beautiful. If you have never used it before, it may take a few minutes to get set up. Fortunately, there are a ton of fantastic resources to help you get started.

Online Collaboration:

Overleaf is a online platform for collaborative LaTeX. You can edit online and download pdf, or you can clone with git and work locally on your computer.

Setting up LaTeX:

Install LaTeX. To do so, consult this handy guide.
Install a LaTeX editor. For a list of good editors, look here. Decent options include texmaker, texworks, and texshop.
Start TeXing! A link to a LaTeX template for this course's homeworks can be found here.

Other LaTex Resources:

LaTeX can do a whole lot of other stuff. If you can think of it, it can probably do it. A couple other resources: