You can use any of these formats for the link.
To link to another page on your website, use "/pathOfAnotherPage" format. The path of the page can be found in Page Settings => General => Url.
Example: If you have an "FAQ" page with url "/faq", then you should use "/faq" as a reference.
NOTE: To link to your homepage, simply use "/" as a reference.
Block linking allows you to link to a specific block on a page. When clicking on the link, it will scroll to a specific block on the same page or another page. To scroll to a section, you use the "#blockName" format, where the blockName is the name for that specific block.
NOTE: "blockName" should be unique across the page.
The block name can be found (and edited) inside the header of each block editor and is also prefixed by a # (see below).
Example: To link to a "Pricing" section of the current page, with a title "#pricing", just use "#pricing" in a link field as a reference.
When linking to a section of a different page, you need to enter the url before the block name.
Example: If you have a "Product" page with url "/product" and want to scroll from "Home" page header to "Product" page's "features" block, you should use "/product#features".
To link to an external website, you simply enter the URL into the link field using a format "https://www.example.com".