There are different types of "splits". It vary between Double splits , Triple splits , And alot more. I'll be covering the most basic ones like Double splits and Triple split.
One split: The most simple type of split in the game , you can do this by pressing the spacebar key (Default)
It is very reliable for simple kills or maneuvering. Most people use this for eating cells one split away from them.
Double split: It is mostly used by players who want to reverse someone or eat cells far away from them. This is done by pressing the keybind for the double split , or pressing spacebar 2 times.
Triple split: This type of split is uncommon for it is risky , it is mostly used for style or eating cells very far away from your position. Although i think the double split's range and the triple split's are exactly the same but i haven't tested this yet
Line split: The last type of split i'm going to cover. Linesplits are very risky and mostly used for style , it is a massive flex if you pull off a linesplit the chat will probably go insane (idk haven't tried it yet).
These are only my opinions and you don't have to get mad for making this post. If you have different opinions on this please do share it with me.