Thanks for your response!
So I would start writing the stuff... but I'm afraid it would be then limited to the functions that I'm using for my site, and of course some explanations depend on the theme that I'm using 😄
@damien123 No additions needed, NodeBB loads the same whether you navigate to it "cold" (that is, directly via url), or locally via SPA interface. You can see that by viewing the page's source. It's indexable/crawlable.
If you're migrating, I'd encourage you to set up redirects so your links to existing topics/categories are not lost, but otherwise, you should be good to go.