When designing a warehouse racking system, several factors must be considered, including the size and type of goods being stored, environmental storage requirements, and safety. Pallet racking is a common design that utilizes pallets to store goods horizontally and allows for efficient storage and retrieval using forklifts. The selective pallet racking system has two main subtypes - one with movable beams and one with a more stable, structural design using bolts. Proper racking system design can optimize space utilization and ease of accessing goods.