This has been a necesary review of what I actually have. I am not a professional, but I absolutly love watercolor. Some of my first paints are cheap and super low quality, but now I have some respectable brands, at least to have a decent projects.
I have to say that I like the way you organize the practices in the classes, so I follow the same guide, this makes me feel confident in how I should proceed.
I have some white spaces in the paper, that is because I want to be optimistic and think that some day I would fill them with some other beautiful colors.
I started with some scholar brands like Pelican and Pentel, I realized that for a beginner, those were fine. They have a sandy and dry texture.
The W&N and Kuretake palette, are the best I have and you have already explained everythong about them.
I don't own liquid watercolor, I would get an entire set soon, so hopefully I'll make the upgrade.
It happens that I had a few neon and some colors of the Kuretake were metallic too.
For Handmade watercolors, I am working on that. It's a project I have in mind.