These are the etiquette one should always abide while playing a normal.
Etiquette number 1:
You shall not rage.
Etiquette number 2:
You shall have fun.
Etiquette number 3:
There are no troll picks. If you want to try something, you can.
Etiquette number 4:
You shall not kill an AFK.
Etiquette number 5:
If someone does an emote spam you do the same.
Etiquette number 6:
You shall not disrupt a dance party.
Etiquette number 7:
If an enemy does something cool, you will give them a compliment for said cool thing.
Etiquette number 8:
You shall not disrupt a mutual 1v1.
Tell me if I need to add something :)
Edit: I do not expect people to always abide these etiquettes. It's the same as table etiquette, you don't HAVE to follow them, but you sorta look stupid/rude if you eat with your hands instead of a knife and fork.