I'm still learning what some of those fancy buttons do. With the layers though, if you have some red lines and then wanted to place some blue lines across without the colors mixing or distorting the red lines; you'd use a second layer on top of the red lines, place your blue lines, then you could merge the two layers to make one layer where the blue sits on the top of the red. It's like painting except you don't have to wait for the red paint to dry before adding the blue paint.
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