This LaTeX template is used by many universities as the basis for thesis and dissertation submissions, and is a great way to get started if you haven't been provided with a specific version from your department.
This version of the template is provided by Vel at LaTeXTemplates.com, and is already loaded in Overleaf so you can start writing immediately.
Checkout this short video to see how to easily create and edit new chapters as your thesis develops.
Please read the unofficial quick guide to the template; it contains some tips and suggestions on how to modify certain things.
Example by LaTeXTemplates.com