Demo-1: Understanding Illustrator’s Control Panel:
http://tv.adobe.com/watch/learn-illustrator-cs6/understanding-the-control-panel/

Demo-2: Understanding Illustrator File Formats:
• ~.ai Adobe Illustrator File (when double click, opens the file by Adobe Illustrator
• ~.eps (Adobe Illustrator EPS File):
The EPS file type is primarily associated with ‘Encapsulated PostScript’. There are two distinct types of .EPs files, one of which is a vector based graphics file and can be opened and easily edited for type, color, etc. in Adobe Illustrator. They can be CMYK color, or flat pantone color based. These files could be “placed’ or “imported” into InDesign, (or QuarKXress, PageMaker, Word, etc.), but not opened by it. If you click it directly, it will be opened by Preview instead. They can be almost infinitely scaled in size without degrading the output because they are vector based. The other is an .EPS photo file, flattened, set resolution “picture” type file. It can be opened in PhotoShop or other image editing programs, also placed or imported into InDesign (or Word, Quark, etc.), but it will be significantly degraded if scaled beyond the set resolution. These are usually CMYK files, or can be set as Pantone duo-tone, tri-tone files.
• ~.svg
If people with vision issues are zoomed in to your site in their browser, normal images would become pixelated. SVG files are scalable, and the files can scale to any size without loosing any quality, without increasing the file size. It just makes sense as a web best practice.
• ~.alt
Adobe Illustrator allows you to save files to templates. Template files can speed up your workflow in Adobe Illustrator. Want to work on a background paper collection? Illustrator template files provide a one-click shortcut to starting with your artboards, color palettes, layers and other settings loaded and ready.
• ~pdf
Adobe Illustrator allows you to save files to a pdf format. If your pdf file was created from Illustrator, the pdf file could be reopened in Illustrator again.