How to debug shaders effectively

Hello, I'm new to Reshade (and shaders in general)!

I think it's a fantastic tool and got me excited about writing shaders. I've managed to write some simple color correction/upscaling shaders, but in order to proceed with more advanced stuff, I really need a way to debug. How do you usually debug your shaders? Can I write to the reshade log? Is there a way to print some text on the screen?

Thanks