There are 3 courses for pixel art. Environment art, character design and animation and a very basic introduction. Imo you should learn pixel art from yt . You can even find playlists for pixel art. I'm learning it from yt. I've chosen mastering game feel course as there are not videos related to the topic on yt though there are short insights. Imo You should choose a course that is not available on yt . You have options it's all yours.