I just discovered the Ctrl+Alt+Mouse1 shortcut where you can hold those three and move the mouse up and down to change brush hardness and left and right to change the brush size. I also see that opacity is in that menu right there. Is there a way to change opacity rapidly like that instead of having to type a new value every time at the top of the screen? I'm using a wacom intuos, but it should work the same as a mouse. Thanks in advance!
You can control the opacity by typing the number on your keyboard:
If you quickly press 1 and 2 = 12%
Great! I never knew this. Thank you.