Fascinating introduction to early hyperlinks: there were 'linkbases' (storing links separately from the content), they weren't 1:1 (one link could point to multiple destinations) and had gossip protocols to update on other servers!
https://moocs.southampton.ac.uk/websci/2014/02/21/open-hypermedia-web/ https://edshare.soton.ac.uk/6158/1/Open_Hypermedia.pptx
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Ted Nelson introducing some of the basic principles of Xanadu, his hypertext design: https://www.youtube.com/watch?v=hMKy52Intac
He stresses the importance of visible hyperlinks, an interesting choice when some UI designers argue that today's underlined links are distracting for readers.
Some fun early discussions on what hyperlinks should look like, even including a proposal for typed links!
Hyper-G is (was?) an interesting hypertext design, where hyperlinks were stored in a separate database to ensure integrity and allow visualisations with trivial backlink calculations: https://www.ickn.org/elements/hyper/cyb20.htm