Acrylic painting, a water-based technique, is easy to do and very versatile. Your main challenge will be how to master dilution and the ultra quick drying time
To lighten your colors, just add a little water to the paint: the more you dilute it, the lighter your shades will be. For darker colors, add paint. Note: without water, the color will be more opaque and cover the previous layer of paint.
The more acrylics are diluted with water, the more transparent they become, so underlying layers show through. By overlaying a new layer of translucent paint, you can change the tone and color of the previous layer.
To master transparency and shade combinations, practice overlaying washes in different colors.
Example: cover a yellow wash with a red wash.
Do a test by mixing the same colors on your palette. Apply the mixture to the medium beside the superimposed washes and notice the results: the colors are not as rich or intense.
The very short drying time for acrylics is a two-edged sword: you have to apply colors quickly and right away, because it is harder to make corrections. In fact, colors can no longer be changed by adding water (unlike watercolors) or by scraping (unlike oils), because the paint is indelible once dry.
To make corrections, use opaque paint, which will cover a feature or a color.