Can anyone tell me how to render an image (tiff) with two different layers, one for background (need it white) and one for the rest of the render (just freestyle lines). I am using Blender 2.8
You want to separate what you want into different collections. Then above collections there are view layers. Make view layers for what you want separated. Go to the collections and right click to exclude from each view layer. Now go to the compositing tab to work with nodes. Add Render Layer nodes for each view layer and select the view layer in the box at the bottom of the Render Layer node. It's also a good idea to make the view layers transparent. To do this go to Properties>Render>Film and tick the Transparency check box.