Don't feel bad for not understanding how to make it work for a big project, it just doesn't. You can try make it work for a big project, but at that point you a

Don't feel bad for not understanding how to make it work for a big project, it just doesn't. You can try make it work for a big project, but at that point you are just implementing database level code in your application. Better to just use something like PostgreSQL. Contrary to popular belief PostgreSQL is actually a better document store than MongoDB via it's jsonb type, operators and GIST/GIN indexing.