RE: Do You Run a Session Zero?

All of this is great stuff. Discord has made it easier for me. I usually make a server channel for the game and just post notes and player information there. Its also good for AMA nights were you can answer question before the next session. I also run several "play test" sessions where we try out new rules before Session Zero to make sure they are both fun and functional prior to the campaign starting.

Something that I would add to the points above would be The Social Contract.

Do you allow non-game related talk at the table?
Do you allow phones or laptops?
Do you require players to always speak in character?
How do you handle food or drink?
Do always play at the same location or do you rotate hosts to share the burden?
How often do you play? Weekly? Monthly? One long weekend once a year?
Is there a set day? A set time? A set session duration?
What happens when someone can't make it?
What happens if someone has to leave the game?
What happens when someone new joins the game?
Do you have a player limit?
Who can invite new players?
What is considered toxic behavior?
How do you handle toxic players?

The list is not exhaustive by any means, but answering these question can help the game run smoother and hopefully prevent problems down the line. That's really the purpose of Session Zero, to head off problems. If your game is going to be a combat heavy mega-dungeon crawl, a player might not want to play their court intrigue and diplomacy character concept.