what is the best software to draw 3d, (architectural prespective) , does the sketch-up give us a high quality prespectives , or it is a combination between autocad and 3d max ,and where can we learn drawing in 3d easily, thx.

Are you asking about Google SketchUp? I've used it a few times and I must say, it's very easy to use. And this is coming from a total newbie! I wouldn't say SketchUp gives high quality perspectives, but it's good enough. If you're just learning like I am, then Google SketchUp is a good place to start.