You may see a Game Master advertise a "Session Zero" for their game. But what is a Session Zero, and what should you expect from one?
What is a Session Zero?
A Session Zero is a meeting between the Game Master and the Players prior to the first session of a campaign or one-shot.
What Happens at a Session Zero?
Every Game Master runs their Session Zero differently, but here are the kinds of things you might discuss as a group:
Does your Game Master allow homebrew content at their table?
How closely does your Game Master follow the rules, or do they embrace "Rule of Cool?"
How should the table handle rule discrepancies?
How does the table use Safety Tools?
How does your Game Master handle Player absences?
What are your Game Master's unique rules for their table?
These are also called "House Rules"
What is the overall tone of the campaign/one-shot?
Some groups may also do their character creation at Session Zero! It is up to your Game Master to communicate to you what their Session Zero looks like.