I have a pretty basic org-roam setup I think. I keep my org files all in a directory called "org" that I sync with syncthing (previously I used Dropbox), and whenever I setup a new machine, I just grab that folder and put it at my user root (with Dropbox I would just symlink the folder from "~/Dropbox/org" to "~/org").

Now no matter what machine I am on and where I make my changes I have them all up to date.

I generally have large nodes that contain all my knowledge, and I split them up as they get too big. E.g I used to have a single UnityEngine node, but over time I have split it up into many different nodes: EditorWindow, ScriptableObjects/UnitTesting/etc..

I have at least one node for each of my projects, and there is a "Tasklist" heading in each of those project nodes which contain all my TODOs, those project files are tagged with the name of the project, so that I can easily write an org-agenda search to grab all the TODOs from a single project into a single view without anything else I have stored in the file (which includes a project synopsis, architecture notes/UML diagrams, general notes, etcc..).

Since I am already in emacs when I am writing code, this keep it very simple for me to have this information as accessible as all my code files are. When I discover a new language feature or have to look something up, I just open up the node for that language, and put that new information in, linking to the source where i grabbed that snippet, or where the full MSDN documentation is stored if I need to go more in depth that my short description I write it. Copying down the information helps me internalize it, and I can easily just search through that file for information I have stored. This means that even if I don't have internet access, I have access to all my previously looked up information I maybe have forgotten.