In a Group at a Restaurant
If someone orders chips and queso and they leave it in the middle of the table where they have to reach to dip a chip, it is meant to be shared. Enjoy.
Make a point to chat with everyone in your group and ask them about themselves.
The bill is split based on what you ordered, unless there was a prior agreement Don't propose evenly dividing the bill once the meal already started.
Be overly kind to waitstaff. Say please and thank you.
Practicing etiquette is about helping others feel welcome and at ease.