If you want to learn the simplest ways of creating beautifully and intensely colourful drawings, consider using chalks and pastels.
Blending Chalk Pastels - TinkerLab
Art, Not Craft! An Intro to Chalk Pastels for the Very, Very Beginner
Chalking Up Narratives: An Introduction to Pastels
Chalk für Anfänger - Ein Marienkäfer und eine Eule, Doris Charest
Pastel Drawing and Painting: An Intro for Beginners
Introduction to Chalk Pastels to Create an Iris Flower
Pastels Plus Links to Tutorials - Your BEST Homeschool
Pastels
Still Life Techniques - Pastel Drawing
weekly online drawing course - DAMIAN CALLAN
Soft Chalk Pastel Techniques
An Introduction to Drawing Animal Fur for Beginner Soft Pastel Artists – Shaymus Art
An Introduction To Drawing With Chalk And Pastels
Pastel - Wikipedia
5 Essential Chalk Pastel Techniques for Beginners - Projects with Kids