I hope this can be helpful to anyone ^^'' Please forgive any mistakes on the text OTL
Two extra notes:VECTOR PEN
I would have liked to explain more about this tool but I think that experimenting yourself is much better. Although I would like to remark that this is really useful to draw objects or symmetric stuff. Also, I use both the brush and the vector pen to do the lineart on this video [link], in case you're interested.
There's a very useful tutorial by ~hannahjenny about this filter
Thank you for reading!