Three key tools
Layers are those tools which segregate elements in an image into vectors and pixels. For instance, while working on a clothing of a model, you work on the colors and the design separately but then create an image by combining those. This can be done using the layers panel.
Using the various brushes to make your image more effective and attractive is done through the brush panel. Brushes of different sizes, shapes, and orientations are found here along with texture brushes also in the recent updates of Photo shop.
Hiding something that you don’t want to be seen in an image you have already created can be done through layer masks. When you apply a layer mask, a particular portion or a detail can be hidden from viewing and also can be recovered by removing the mask.