>>7751218
not a course, but these videos helped me a lot

https://youtu.be/GjMuFxxwgPo?si=VNzw-qEGch77bt8Z
https://youtu.be/f-tMC72ihhE?si=0zJEPs9eRPmQxELD
https://www.youtube.com/live/DC-yPd1tHF8?si=H4tBxJV_5LlbDDFn
https://youtu.be/7a3oDgZ1-JE?si=C8wVlReKMK61WJlS

you could also watch other artists drawing process to see how they deal with it

looking at artworks and taking inspiration also works