Text can be proportional and also fixed width . Text can be centered. And you can use a combination of these attributes. They can be unnumbered. Or they can be numbered.
Lines help to set apart topics and can have different thicknesses as well as darkness.
Here is an example of an internal link. Here is an example of linking to a specific page at an address, the grad. Here is an example of a link to a specific place in an external file. Here is a link to a local graphic that is a GIF format file. . Now load this JPEG file to see the difference in how they load to the screen.