Are there any good techniques for watercolor, acrylic, oil paints, pencil, and colored pencils? And what are they?

For colored pencils on a canvas, You can either draw directly onto the wood with your colored pencils, or you can prepare it with a light coat of Golden Pastel Ground ... Apply Golden Pastel Ground to canvas to create a toothy surface that can readily accept colored pencils. If you want to draw on canvas, this will allow you to do that.

For watercolor pencils, Watercolor pencils are a medium that combines drawing with painting. When you add water to a watercolor pencil drawing the pigment spreads over the paper to imitate the look and feel of a watercolor painting. Working with these kinds of pencils is a great way to experiment with colors.

It Is Not Recommended to Dip the Tip of Watercolor Pencils in Water. It is not recommended to dip the tips of Faber-Castell watercolor pencils into water as it will compromise the integrity of the pencil. The lead and wood become soft and will become brittle which will then break easily.

dont press down hard on what yoou are painting/coloring