This short example shows how to use fonts available on Overleaf to write Hebrew; the list of available fonts are here.
For more examples on using the polyglossia and babel packages to typeset Hebrew (and other languages), have a look at this and this help page.
This example shows how to use the free Linux Libertine fonts on writeLaTeX. The Libertine font family provides serif fonts similar to Times New Roman.
The source code is based on The LaTeX Font Catalogue.
This examples shows how to get started with Adobe's Minion Pro fonts on Overleaf. The approach is simply to upload the Minion Pro OTF file(s) you need to Overleaf via the project menu, and then include them in your document using the fontspec package for XeLaTeX.