It looks like there is still a lot to learn. But I am wondering, by using terminal, isn't there any danger that I would screw something in the system by misusing it incorrectly?
Yes you can mess up your system, so if you are new to using the terminal interface, you might want to make sure you have regular reliable backups 🙂
If you want to explore the Terminal interface, you might want to look for something like "Learning Unix for Mac OS X Tiger" and ignore that fact that it says "Tiger" as the Unix side has not changed much since Tiger. Heck I'm still using Unix skills I learned in '85 🙂
And how do I access it? Where do I find that Terminal ikon?
I am wondering how the Terminal icon go on your Dock. Of course if it was running it would be displayed and when you
Quit Terminal it would go away. In that case it might have gotten their because you double-clicked on a shell script. That might do it.
Terminal is in Applications -> Utilities -> Terminal.
There are also alternate terminal emulators available. I personally use iTerm from <http://iTerm.sourceforge.net>. And there are several flavors of X11 based terminal emulators available. If you do not know anything about terminal emulators, then stay with Terminal. But they can be like fine wines, you have to aquire a tasts for them 🙂