Zentangle has added their stamp of approval an some of the supplies I've listed below but I tend to use the non-official aka less expensive versions more.
How to Get Started as a Zentangle Beginner – Tangle List
MY FAVORITE SUPPLIES - Zen Linea
The Best Pens for Zentangle in 2024
Encouraging Words & Quotes for Artist Trading Cards ATCs
Easy Zentangle Patterns for Beginners and Kids
About Zentangle — TANGLE & INSPIRE
Best Mandala Coloring Books for Relaxation and Mindfulness
How to Organize Adult Coloring Supplies Pencils Stencils and More
How to Use Markers and a Blending Pen with Zentangle
Easy Zentangle Patterns for Beginners and Kids
Best Colored Pencils-Adult Coloring Supplies for Coloring Book Addicts
Zentangle how to books & tutorials to learn this Mindful art practice
Zentangle Art Lessons - THAT ART TEACHER
Best Mixed Media Art Supplies for Online Art Classes