Both came with your Mac. Terminal is used for controlling your monitor. TTY is for teletype. It is a very simple terminal where text scrolls on the screen in characters and lines. VT-102 is a DEC terminal which allows some special commands such as a clear screen.
File transfer determines which protocol is used for transferring files.
Text can transfer files between Macs and PC's. Receiving Folder establishes the folder used to save captured text and downloaded files. To be able to use the mail capabilities of ClarisWorks, you'll need a couple of things. You need to be running System 7 Pro, System 7.5 or greater, and have the PowerTalk extension in your System Folder. Of course, you'll need to able to communicate with other computers on a network or with a modem to be able to use mail.