a note-taking/note-making app comes to my mind: Obsidian
it's a very powerful tool but has a learning curve, very easy to link/backlink to any notes you previous took, best of all, it has a graph view to literally see how your notes link together, you should definitely look it up.
however:
it's not web-based, however, you can sync your notes by using Cloud services so you can access it on any device (Obsidian charges $8 per month for syncing, but you can work around it by using your personal cloud for free)
a note-taking/note-making app comes to my mind: Obsidian
it's a very powerful tool but has a learning curve, very easy to link/backlink to any notes you previous took, best of all, it has a graph view to literally see how your notes link together, you should definitely look it up.
however: