Illustrator is very easy and fun program to use. I for one found it to be the best editing program to learn and use to create web pages. In illustrator you can create or edit any image or object making it very useful to get your creative juices flowing. Unlike Photoshop, illustrator’s tools are much more user friendly.
Illustrator is vector based program, witch means shaps or lines are put together by mathamaticl equasions so no picselation in images. Witch means you can make any shape or image any size and it will still look normal and not picselated. Alot of graphic designers use the program and then main reason for this is the program is that easy to learn, any idiot can call him self a designer if he is using illustrator.
Discusing the basics of illustrator, Its got the all the functions that photoshop has. the selection tools that does just what it sounds like. you use it to select an object or image if you want to cut it or edit it in any way. You can also use the magic wand tool to select or deselect an object or image.
The best function how ever for me is the perspective grid tool because I work with 3D images alot it makes it easy to design a 3D model of a bulding or image to give a client a beter view of the bulding or image he wanted you to design.