I wanna learn Photoshop

You should go to the nearest library or bookstore and get few books of photoshop. Then download PS trial or buy full version of Photoshop or Photoshop Elements. There is no learning without training.

I think it's much easier to follow instructions of book instead of a web site. Same time you can do exercises without annoying window changes. Unless you have to displays.

I'd recommend to start with some photoshop basics -books, that you learn the basic tools and the whole workspace. Then if you really want to learn professional color corrections etc., read some books of Katrin Eismann and Martin Evening. T.ex Adobe Photoshop CS4 for photographers is very comprehensive and instructive book.

If you want to do photo manipulations like photomontases and changing heads, try some books of Scott Kelby.

When you've familiar with PS, then you can use web resources to find out some special tricks. Finding it's much easier when you know exactly what you are searching and know the correct terms.

http://www.photoshopessentials.com/

http://www.myjanee.com/tutorials.htm

http://home.zonnet.nl/epragt/tutorials/photoshop/index.jsp.htm