I would highly recommend talks by Bruce Momjian https://momjian.us/ https://momjian.us/ he has separate talks on pretty much everything related to PG + All The

I would highly recommend talks by Bruce Momjian https://momjian.us/ https://momjian.us/ he has separate talks on pretty much everything related to PG + All The Dirt On Vacuum talk by Jim Nasby https://www.youtube.com/watch?v=L8nErzxPJjQ https://www.youtube.com/watch?v=L8nErzxPJjQ