If you want to learn the simplest ways of creating beautifully and intensely colourful drawings, consider using chalks and pastels.
Pastel Drawing For Beginners: A Complete 101 Hobby Guide
A introduction to Soft and Oil Pastels for Artists
Art, Not Craft! An Intro to Chalk Pastels for the Very, Very Beginner
Leaf Drawing- How to Draw a Leaf with Glue and Chalk - The Kitchen Table Classroom
Introduction to Traditional Media: Chalk Pastels
Soft Pastel for Beginners: How to Draw with Soft Pastel
Leaf Drawing- How to Draw a Leaf with Glue and Chalk - The Kitchen Table Classroom
Pastel, Techniques, History & Uses
Ideas
Creativity Camp: Chalk Pastel Fireworks — DALLAS
How to Draw Waves with Chalk Pastels
VIOLETTO Soft Chalk Pastels Set Art Supplies for Artist Kids Adult 64Colors + 2Sticks Colored Chalk Non Toxic Dry Square Pastel for Painting Hair Chalk Pastels Short Pastels 64 colors
How to use Chalk Pastels in the Artroom
An Introduction To Drawing With Chalk And Pastels