everyone should start w a basic grasp of anatomy before delving into stylized cartoony stuff, but its actually not nearly as hard as it looks/sounds. figure drawing from reference pictures is a lot easier than making up cartoonish styles in ur head, because the learning curve is so sharp.
just start drawing people you see- watch youtube videos that show candid crowds, pause it for a bit and give yourself like 1-5 minutes to quickly draw the pose and figure, and then let it go and move on to the next pose. make em vary in size from whole page to half page to ¼ page, knock out like 10 in one session, and after a few sessions i guarantee youll notice a difference. focus first on the angle & twist of the torso, and then on the pose of the arms & legs, and THEN on fleshing it out/lightly shading. its really easy to pick up, and once youre comfortable with it, you can try simplifying your linework a ton and exaggerating shit to get cartoon-y looks you enjoy that actually look 1000x better because the human eye/brain can make way more sense of them.
if you cant read my handwriting:
no reference “cartoon-y” -> life drawing from reference -> simplify (less lines, fewer details) -> simplify into shapes, exaggerate proportions -> (when to stop simplifying is up to you!)
this is a good site for references (though not a lot of variety if you have more than one or two specifications in the drop down menu), and this is the picture i referenced