If you make a spelling mistake while typing in Skype chat, hit the up arrow on your keyboard. This will highlight your last entry and allow you to correct your error. The correction will appear on your Skype screen as well as the screen of the person you're chatting to.

If you're trying to determine whether a website is having issues or if it's simply something on your end, visit this site. Enter the website's url and find out whether the site is down or if you'll need to continue troubleshooting.