How to write using TeX
Assuming you are on a Windows machine (as you tagged this in your question), if you download MikTeX here, and download the installer, you won't end up with a whole bunch of folders.
Just navigate to the downloaded file and open it. Then it should guide you through the installation.
ALevel Student
A level: (noun) a qualification in a specific subject typically taken by school students in the UK aged 16–18, at a level above GCSE. The equivalent in Scotland is the Higher. As of July $2021$, I am no longer an ALevel Student, which is a little sad. It is with greater regret that I will only be very slightly active on MSE for the next year (approximately), starting from August $2021$. Thank you all for teaching me so many things, and I hope that I've helped some of you with my posts. Good luck and goodbye, until July $2022$. List of useful integration techniques that aren't beyond high school level: What other tricks and techniques can I use in integration? Some of my best/most interesting answers on this site: Proving $\sum_{k=\infty}^{\infty}\frac{1}{64k^4+1}=\frac{\pi}{4}\frac{1+\mathrm{sinh}(\pi/2)}{\mathrm{cosh}(\pi/2)}$ without using residues or contour integrals Solving $3x^4+6x^3+x^2+6x+3=0$ exactly. Finding sum of the roots of $(\sin x+\cos x)^{(1+\sin 2x)}=2$ How to calculate this trigonometric sum Prove this formula $\frac{1r\cos(x)}{12r\cos(x)+r^2}= 1+\sum_{n=1}^{+\infty}r^{n}\cos\left(nx\right)$ Evaluate $\sum\limits_{r=1}^\infty(1)^{r+1}\frac{\cos(2r1)x}{2r1}$ Solving $2^x+2^{x}=2\cos\frac{x}{5}$ Finding real $(x,y)$ solutions that satisfies a system of equation. If you specifically want my help, then please email [email protected] with your problem. No guarantees though. :)
Updated on September 18, 2020Comments

ALevel Student about 3 years
I've downloaded MiKTeX as I'd like to write a Mathematical document using it (I've had some basic experience using LaTeX on the Maths Stack Exchange page as it requires everything like equations to be written using LaTeX I believe) but I'm not very good at computers and now I've downloaded it I don't know where to go from there. The download seems to have 1k+ folders and I have no idea where to go. Do I use a Word document and then somehow convert to TeX or does TeX have a special writing template I can go straight to to type in?
Thanks.

David Carlisle about 3 yearsyou might like to work through a tutorial such as learnlatex.org that will let you edit the sample documents inline in the page and get a feel for how it works before using your locally installed miktex system (and some tex editor such as texworks)

ALevel Student about 3 years@DavidCarlisle thanks for that. What sample docs do you mean?

David Carlisle about 3 yearsafter the first couple of lessons there are two or three full (small) documents on each page that you can process with latex as given or edit and see the output

ALevel Student about 3 years@DavidCarlisle I understand now, thanks :) Thank you so much for providing that link, that's incredibly helpful of you!

Teepeemm about 3 yearsYou will probably want to use a program as an IDE to edit your TeX files. There's a nice summary at tex.stackexchange.com/questions/339/latexeditorsides. Word is definitely not in that list.

Fran about 3 yearsA basic start: (1) Open TeXworks (it should be already installed) (2) Go to File > New file from template (... or so) > Basic LaTeX documents >
article.tex
(3) Save the new file asmyfirsttex.tex
or whatever (4) Under File menu, click on the green triangle. That is all, if all packages were correctly installed, now you should havemyfirsttex.pdf
in the same working directory and a preview window at the right side. Now study the comments of the template to understad a bit the syntax, experiment with the examples of this site, read a book ... 
Skillmon about 3 yearsJust to be that guy who knows everything better: The maths input on stackexchange sites isn't using LaTeX but MathJax (though the syntax is LaTeX inspired and in most parts identical).
