If you're happy with the program, you can request an activation code to continue using it more than 30 days. In essence, the free trial version of Photoshop acts as a full version until the trial is done. With this free download of Photoshop, you're able to test out the program for 30 days and try it out for yourself. With that said, there are literally thousands of different Photoshop tutorials available across the web from forums to enthusiast web sites.
This program comes packed with so many different features and tools that it is indeed difficult to sum them up here.
If you haven't tried Photoshop yet, this is the perfect opportunity to give it a try and find out why 'to photoshop' has become a verb in most English-speakers' minds.