When I flush my toilet or run my water I hear a very loud gurgle sound through the house, what is it?

Could simply be the water travelling. Does it back up or appear to be clogged?

Loud banging noice when toilet is flushed

Wvsherwood, If this is a new person with a new issue please open your own new post. It gets too complicated when we have multiple people asking questions. By the way, a loud bang is likely water hammer when your fill valve shuts off.