1 - How to paste stuff without creating new layers.
When I paste something it creates a new layer if I have pasted something in current one. How to make it so I can paste in 1 layer multiple times?
2 - How to make adjustment layer work on certain layers but not all below it? Like I want to set hue adjustment layer to render image without changing background adjustment...
3 - How to make my own patterns?
I probably missed something

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it all depends on what kind of pattern you want. but to make it go to Edit>Deffine pattern. I'm pretty sure thats where it is. Go to www.good-tutorials.com for more.