how do you only colour in one area without it going over on the background. For example if you have a circle how can you colour it without the colour going on the background. Another question I have is what do all of the modes do and you do you use them. Like the addition, burn, colour, colour dodge, darken, erase, lighten, luminosity, multiply, normal, overlay, saturation, screen, and soft light (SVG)?

Masking: https://docs.krita.org/Clipping_Masks_a ... nheritance
Blending Modes: https://docs.krita.org/Blending_Modes