The life of an order
What an order is, what a check is, and what "closed" means for each — the distinction behind most till confusion.
Taking orders
Build a check, choose order types, apply modifiers and discounts, split checks, and void items.
Coursing and firing
Hold a course back, fire it when the table is ready, and keep the kitchen sequenced.
Splitting and transferring
Split a check by item or evenly, move items between checks, and move a whole order to another table or server.