I recently did a paint swap with a friend and received a set of student grade gouache. I used this course to help explore how to use this (mostly) new to me medium! Lots to learn yet... Definitely need better brushes. 
I was also inspired by this class to make swatches of all my acrylic paint colours (and discovered I have two !! Acrylic Gouache paints hiding in the bottom of my paint bin).