If you want to organize your notebook but you don’t want to deal with sticky tabs or other items that poke out from the edges of your notebook, this hack is for you. With a marker, you can create sections by coloring the edges of your notebook. Use a water-based or a non-bleeding marker if you don’t want the color to seep into the pages. If you prefer a monotone look, use a black marker instead of colored one for a uniform, monochromatic look.