I'm sorry, what links are you talking about?
I have a German-language system so I don't know the exact expressions in English. There is a bookmark bar under the address field in Safari. Above the tabs bar. You can activate it by "Safari menu - View - Show Bookmark Bar" or something like this. And with Apple key + <Number> you can directly choose any of those bookmarks in the Safari's bookmarks bar if activated. By default. Please look in Safari's Main Menu "Bookmarks - Bookmark Bar" - these shortcuts are activated even when the app is set NOT to show the Bookmark Bar located between Address text field and Tabs Bar.
There was some confusion on this (Cmd+<number> or Ctrl+<number> for changing spaces) earlier in this thread:
https://forums.macrumors.com/showthread.php?p=4430259#post4430259
https://forums.macrumors.com/showthread.php?p=4429693#post4429693
(see "edit" there)