i use shortcuts while working in adobe illustrator constantly, and find that it's an incredible time saver! it makes things easier, quicker and more streamlined. however, it can be really hard to learn shortcuts for any new program (just put me working in photoshop and i'm lost!). that's why i really like these keyboard shortcut guides. you can use them to refer to, or set them as your desktop background to keep them handy at all times.