How to manage memory in a 2D Platformer game?

I have some basic knowledge in Unity and Programming. I am thinking of creating a 2D platformer game. but I dont have any idea about managing the memory in it. I learned Object Pooling stuffs but I just need to know Is there any special methods to create levels in platformer game ( to place an object somewhere ) or Is it fine to design all the level in game scene editor and make the camera follow the player? This is not a auto random generating game. I have all the level ideas and setups. I just need to know how to manage memory and increase performance in my game. Sorry for my poor English. Thank you