I am an old photographer but new to Affinity Photo. I am stepping through the tutorials after trying to use the software without first having a solid foundation. Hopefully you were taught like me that there are no stupid questions. Please remember that when you reply. The basis of layers is to modify the document (image) non-destructively and build the image modifications in a hierarchy. that can be switched off/on, deleted or moved. However, to use say the Inpainting Tool, the pixel layer has to first be selected. Am I missing something? So when I use a tool to modify an image, and the pixel layer has to be selected, all changes are permanent (destructive) once they are applied? If that is true, it seems odd that something as profoundly complex as re-touching, ie eliminating a person or object from an image, is basically destructive. Should a print comeback showing a defective alteration technique, one would have to work from where the image is currently and not start over. Please help in basic terms.