I have a good understanding of java and wondering how to learn slick2d to make games

i tried youtube videos but im just supposed to copy their code and after the video ivwont be able to do it by myself

because it does not really teach

You don't.

It's dead Jim. Learn LibGDX instead. It's (arguably) better and infinitely more supported. Oh and look! I've got a tutorial series for it. ;)

Seriously, Slick2D was abandoned about 2 years ago; even with some recent signs of life it's pretty much a dead end.

You can check out the Slick Wiki and Slick Forums.

It seems like most of the content that was on the wiki is now gone though.

Many people have abandoned slick for libGDX after development stopped.

oh thank you guys very muchill try out libGDX