It's pretty incredible how often I put “Reddit” in a Google search. It really is the quickest way to get a good answer to most questions, from how to fix an Excel error to which robot vacuum is most reliable.
I still remember the vacuum dude. There was a legendary post probably a decade ago made by the world's most knowledgeable vacuum salesman. He laid out all the secrets of the industry, and went into detail I didn't know I needed regarding how they all work.
To this day I remember his advice: get a bagged vacuum if you want a clean carpet.