@nprofile1q... yea... that stuff is pretty hard
i myself still struggle with it
all i can advice is to go to a library and lend some books about art / anatomy
or if you have the money then buy some arts books from amazon and then
well, it's hard to say, but you gotta grind
draw figures, draw poses, all the time - the more you draw the better you will understand forms and figures, until it comes naturally
but be aware, that process can take up decades
sadly only very few artists are naturals