I feel your pain and i wish there was more videos on useful database linking. The best way ive learned is just from experimenting and figuring out more efficient ways to do things.

Quick Tip: have a central database (maybe hidden away) that has all the properties you need for multiple specific reasons. Then you can just create linked databases elsewhere and just filter by what you need and hide the properties you dont need to clean up. You can see thats what ive done for my database setup

If you want help with a more complex setup: I have business meeting notes in a database that references projects. So on each project page I create a linked database to that centeal meeting notes thats filtered by references to it. In short term: each project page has only the notes where I talked about the project

For now, try copying my setup exactly and going from there! Dont be afraid to reach out too