Vi is a visual editor commonly available on UNIX machines. If you are new to vi, you may want to see if vim is available on the machine(s) you are using. Vim is "vi improved" and provides syntax coloring (very helpful) and some other neat features.
The two files below are from email messages sent to a student who had to use vi for the first time. They contain basic information that may be useful to others starting out with this common editor.