Skuzzy: you misunderstood me. I was asking how do I know I am root. According to bizman if I made only one account, I'm root, and therefore I should create another account with only user privileges (which would be a pain as I already have email, bookmarks, etc transferred over from XP). It would have been nice if Ubuntu's install mentioned this; perhaps it did and I didn't notice.
Bizman doesn't know Ubuntu then it seems. Ubuntu has the root account disabled by default. You're logged in as a regular user but whenever you need to do installations etc. you're asked to 'sudo' which is 'super user do'.
Sudo is a system which allows a regular user to temporarily act as an administrator if he types in his password. So you're using the computer as a regular user and if something tries to attack your computer it can't do anything serious basically. You also know if you're root by your username which is surprise surprise, root on the distros that do allow using the root account. If you are on the command line you can see from the symbol on the command line if you're regular user or not. Regular users have usually (depending on the type of terminal used) the symbol $ in the beginning of each line and root has #.
A couple of Ubuntu hints:
Unless you already did (as ubuntu offers them automatically after the first couple minutes of use), go to the 'system' settings and locate a button called 'additional drivers'. The older versions of Ubuntu look like this:
And the latest 14.04 (software updates):
From there you can install the same kind of graphics etc. drivers to your linux that your Windows used. It will automatically detect your hardware and suggest a driver for you. The closed source drivers can have 2x performance in 3D applications, but the open source drivers are usually smoother on desktop. So only install the proprietary driver if you plan to play 3D games. Also note that if you have an AMD graphics card, their linux drivers are problematic. AMD has (now) excellent open source drivers so try even gaming first with the default drivers if you have AMD: On NVidia the linux drivers are excellent and usually problem free.
Go to the software center and search and install 'ubuntu restricted extras'. That will add many closed source things such as windows fonts, dvd and flash play etc. You can also play many windows games on linux if you install 'playonlinux' from the software center. I'm playing world of tanks with my linux for example. You can also find all sorts of cool and free stuff from the software center.
You'll find a multitude of useful websites advicing you to tweak and improve your Ubuntu install. Once you get more comforable with your Ubuntu you can try them out.
Remember that if you happen to mess something up, you can always just reinstall and you won't be nagged for activation keys etc. afterwards. If you take a backup of your 'home' folder then all your personal stuff will also remain safe. More tips:
http://itsfoss.com/things-to-do-after-installing-ubuntu-14-04/