Take 8 weeks and dive in to gain everything you need to know to paint with gouache and poster colors!
Painting With Gouache
Illustrative Painting with Gouache by Jennifer Orkin Lewis - Creativebug
The Gouache Course - Learn to Paint with Gouache
30 Day Gouache Challenge - A Way to Develop Your Gouache Skills and Develop A Daily Habit, Umashree Taparia
Journey to Gouache: Landscape Painting - artjobtraining
Your complete in-depth guide to gouache painting - Gathered
Online Course: Painting a Landscape in Gouache - Step by Step from Skillshare
My project for course: Painting Atmospheric Landscapes with Gouache
PSA: Study Classic Anime Backgrounds (think: Ghibli) in Gouache Online Course with Justin Donaldson [see comments]