LaTeX is a strongly typed language engineered for technical documentation. The main advantages of using LaTex is the programming keeping everything in the document together in the right place automatically. It is a reliable program for type setting, footnotes, bibliographic, images, captions, tables, cross-references. Various packages help in creating a sharp and nicely written articles, books, reports, etc.
TeX -Latex Stack Exchange is a questions and answer site for users of Tex, LaTex, ConTeXt, and related typesetting systems.
Select the New Project option on the top left of the page.
There are various options to create a document-- choose blank project to create project from scratch. "Example Projects" is projects overleaf offers and "Upload Project" is to upload your own existing project. You can also upload projects from GitHub.
If you are creating a new project, choose blank project.
Enter your project name and click on create.
See the below PDF for further tips for using LaTeX.