Need help with screen space shaders in unity

Hello, i want to create some screen space shaders, you know like camera distortions and stuff (something like Amnesia did with the camera when your player saw a monster) but i dont know how to set it up, i’ve done some shaders for objects and stuff so i kinda know how things work, but i cant find how to make a shader be like a post process effect (like in ue4 you can create a post process material/shader). Any tip or tutorial would be amazing because i cant find anything that helped me thus far. tyty

this website is excellent for shaders in unity. they have one on post processing: https://catlikecoding.com/unity/tutorials/scriptable-render-pipeline/post-processing/

Ronjas tutorials are also really good. dont go into as much depth but simpler to understand:

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