Same spot every time.
As you will see in the following videos, my colors are in the same spot all the time. I keep my white in the left corner. I know left handed painters who keep their white in the right corner and their colors move off to the left. Some painters run them down the side… Do what feels good for you, being sure to keep the paints close to the edge to leave as much room for mixing as possible. Find what is comfortable for you, and then do it the same way each time so you become accustomed to reaching for it in the same spot every time. Here we go!