Fin placement along with fin type determines how fast your board is and how your board turns. Traditional surfboards didn’t have fins which made turning and big wave surfing very difficult. The distance between your fins and how far your fins are from the tail are very important they change how fast your board is and its maneuverability. If your fins are spaced close together then your board will turn easier. The farther your fins are from the tail of the board the looser it will be. There are four main types of fin placements there is the single fin, twin-fin, tri- fin, and the quad-fin setup.
The single fin is mostly found on long boards. The benefit of this is that it gives you less resistance which means more speed. The maneuverability of this set up depends on how big or small your fin is.
The twin fin mostly found on fishes because it is very loose and is good for doing spin tricks. The twin fin set up is not as fast as a single fin but are excellent for stalling in barrels.
The tri fin or thruster fin set up is the most common. They are a combination of the single fin and the twin fin and offer you stability along with maneuverability.
The quad fin set up is not very common and is mostly found on fishes. This is basically two twin fins right behind each other. It gives you the maneuverability of a twin fin with some extra stability.