What do you need to know to build 2D apps with unity3d?

Question

Unity

At the moment I have unity 5.1.2. I have created a 2D project. Are there any unitypackages for creating a 2d interface? What to use? Maybe there are some lessons?

Answer 1

there are no good free 2D examples and projects, the maximum that can be more or less normal in this regard is CorgiEngine (of course, knowing where you can get it;), and then, primitively limited in functionality. There is nothing more worthwhile in the asset store, I rummaged through it all, there is one crap that is not worth it.
I also rummaged through the entire github in search of open normal projects in 2D, there is nothing good there either.
Of the lessons, you can only watch something on YouTube, but this again will not give you much, due to the dependence of the engine on paid packaggers, which will take more than one year to figure out.

Answer 2

Basics of working with 2d in Unity3d
Officially available on the website of the company Unity3d.com section tutorials.

Answer 3

and there are many free examples, ready-made projects and 2d kits in the assetstore