List things together or say who you do something with
と joins nouns into a complete "and" list, or marks who you do something with.
JLPTN5
Noun と Noun~ to ~
A and B (complete list); with [person]
Example Sentence

Mix red and blue to get purple
Between nouns, と means "and" and lists items exhaustively, implying nothing was left out. After a person's name it means "with", marking who you did something with. It also marks quoted speech or thoughts, coming right before verbs like いう ("to say") and おもう ("to think").
Tips and Common Traps
Build the Sentence
JLPT N5Bread and eggs
Arrange the words in the correct Japanese order:
パン
breadたまご卵
egg と
and / with