LaTeX is software which allows you to create documents using special commands which you write in the text, unlike an application like Microsoft Word, where you format the text using special buttons.

The LaTeX software is used inside many different applications. There is only one Microsoft Word, but there is not only one LaTeX application. Instead, there are multiple different applications you can use, which allow you to write the LaTeX commands, to create your document.

One of those applications is called Overleaf. This is a website where you write LaTeX commands. Overleaf is sort of like Google Docs: Google Docs lets you make documents like in Microsoft Word, but online, on a website. That’s what Overleaf is, but for the LaTeX way of making documents: making them online.

I recommend you start with Overleaf. You don’t need to understand how or what to install, that way. For a beginner, I don’t think you will have any significant benefit from installing a LaTeX application onto your computer. Once you get better at LaTeX, then you might want to do that, since it does have some advantages, like more customization, features, and offline use.