I wrote a tutorial for toon/cel shading (link/source in comments)

Unity Toon Water Shader Tutorial at Roystan

Making A Stylized Toon Shadering Within Unity

Help with screen space mapping in Shader Graph. Like with the Screen Position Node, but without having it move when you rotate the camera

【Unity】Shader Graphが楽しすぎる！基本的な使い方を紹介

Learn To Use Shader Graph To Create Awesome Effects In Unity

Announcing the Shader Graph UGUI Shaders Sample