Core Practical Techniques for kids paint by numbers kit:

1. Painting Order: First paint large areas of the background/main subject's base color. Once dry, paint the smaller details. Beginners don't need to strive for gradients; flat application will produce a clean effect.

2. Brush Usage: Use large flat brushes for large areas and small round brushes for lines/details. Apply one color per brushstroke; avoid repeated brushing to prevent the painting from becoming muddy.

3. Paint Texture: Children's oil paints don't need excessive thinning. Thick application makes the colors more vibrant and can create a simple three-dimensional effect, suitable for children's handling.

4. Error Correction: If you make a mistake, don't wipe it off. Wait for the base color to dry, then simply cover it with the correct color. Oil paint has strong coverage, making it easy to correct small mistakes.