to quit, you can also click on the icon in the dock and hold until a menu pops up. then u can click "quit". cmd-Q is definitely the quickest.

changing icons can be done in a few ways as well. i know 2 ways:
1. find an icon you like and copy it. highlight the thing you want to change the icon and type cmd-I to Get Info (or ctrl-click). in the Info window, click on the icon on the top left, making sure you can see it highlighted, then type cmd-V to copy. voila!
2. use apps. i use pixadex and candybar, imho the best apps to manage your icons.
sometimes, you have to log out / restart for the change to completely take place.

wallpaper? deviantart.com has loads. there's a special section for widescreen.

deleting / uninstalling apps is as easy as binning it. the pref files are still in the library. so, if you're anal (like me) use AppZapper. it won't clear up a lot of space though, as the pref files are not big.

^^ lol.. glad u found it useful. u can also do all sorts of stuff when ur friends start harrassing u abt owning a mac.

- hold the shift button while minimizing / maximising windows. prepare yourself to go "ooooooooooooooooooooooooohhhhh".. i know i did. haha, yes, i'm easily amused.

- try the shift button with dashboard as well.

- try ctrl-option-cmd-8. don't forget this combination!

- r u using a MB / MBP? if so, try holding ctrl while scrolling up with 2 fingers on the trackpad. it'll zoom in. if cannot, then you have to enable this feature first.

^^ try making that albm a compilation. select all the songs in that album, and then in the 'look info' window, change to 'compilation' option to 'yes'. make sure the checkbox is ticked, then click ok.