Things to know about 2D games!

Questions & Answers
1

Well,
I am trying to develop a 2D game in Unity…

SO, what are all the things fundamentals and optional
that I need to know for creating the 2D game!!

P.S. I am talking about technical stuffs in Unity and not the creative,artistic Perspective!

P.P.S. I would be glad to know about the extra tools that can aid the 2d Development!

2

If you mean 2D as in “the player is restricted to movement in only two dimensions”, then: http://cgcookie.com/unity/cgc-courses/lunar-landing-series/

If you mean 2D as in “graphics will be created as sprites rather than 3d models”, then: https://www.assetstore.unity3d.com/#/search/2d