People should start using these apps as simple note-taking apps and extend/adapt them based on their needs, rather than diving head-first into these complicated methods/systems to form a "second brain".
If you go straight into OPs system you'll spend way more time trying to figure out how it works (and it might not even work for you) rather than getting actual work done
Start simple. Write a few notes. Maybe you need to draw things: add Excalidraw. Maybe some note structures are similar: consider Templater.