Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Thankfully for Ubuntu users who need a bit of help, there is a wealth of knowledge easily available. Beginning with the installed help files, you can also turn to the wiki, the Ubuntu forums and, lastly, the greater Internet.
First, let's look at the installed help files. Every program that Ubuntu ships with, and nearly every program from the respositories, comes with some sort of help. In the program itself the help menu is usually furthest to the right. Alternatively, in most programs, F1 will launch the help browser.
If the offline help files can't help you, the next place to try is help.ubuntu.com. Beyond an online copy of all the offline documentation for each supported version of Ubuntu, there is also the community contributed documentation wiki.