How does the Solid Fill method work in blender 2.83 2d?

Question

Blender

Hello ! In general, such a question from a beginner in general in Blender. First let me say I am interested in Blender 2d animation. Using the method of poke and scattered videos on Youtube, I figured out a little how to make the simplest animation and render it in a video. But here's the bad luck, it would seem in the simplest stuck. There is such a Solid Fill method, in theory it should immediately fill my shape with the selected color, but it does not do this, it just fills it with gray. Can you tell me what I am doing or is this a bug? And are there any Russian-language resources for newcomers to Blender. And is it possible to create 2d animated videos, for example, 10-20 minutes long, or is it worth choosing another program, for example, OpenToonz. I just took a closer look at Blender, how there is a video editor there, there are a lot of opportunities in one program.

Here I chose green


Here I draw a shape, and it is filled with gray, not the selected color