Which product was ordered the most in 2018?
product refers to Product Name; ordered the most in 2018 refers to MAX(COUNT(OrderNumber)) where SUBSTR(OrderDate, -2) = '18';
SELECT T2.`Product Name` FROM `Sales Orders` AS T1 INNER JOIN Products AS T2 ON T2.ProductID = T1._ProductID WHERE T1.OrderDate LIKE '%/%/18' GROUP BY T1._ProductID ORDER BY COUNT(T1._ProductID) DESC LIMIT 1