Itemization in League of Legends is a crucial aspect of building your champion's strength and adapting to the needs of the game. Choosing the right items based on your champion, the enemy team composition, and the state of the game can significantly impact your effectiveness in matches. Some useful guidelines for itemizing effectively include trying to avoid buying utility items such as grievious wounds on carries as they are often more effective just buying more damage, and making sure you buy the proper resist items as a tank by looking at the enemy team's damage spread.