The text can contain links to other project artifacts, so you can open them quickly or analyze and track dependencies. Use the button on the editor toolbar, or the "Insert link to artifact" context menu, to open the artifact search window.
If the section or artifact name changes, the link name changes as well.
To add a link with the title (text) you want, use the standard buttons on the editor toolbar.
The link address can be a link to a project artifact.
If you insert a link to another requirement into a requirement's text, the latter gets a back link in the "Traces" section, in the "Used by" field. This field can be shown in modules and reports. You can therefore track requirements that reference this one. The same applies to other kinds of documentation: test documentation and operational documentation.