If I open my GUI using the command "cd / opt/lampp" but the app is called xampp (I got it from the xampp website as instructed by my professor), is it lampp or xampp? How can I know the difference? People are saying xampp is a security hazard for some reason. Please excuse me if this is a duplicate question, I am very known to Ubuntu 16.04.2. Also is their an instruction manual I can get somewhere, that has all the terminal commands and their respective definitions and uses?
Thanks so much in advance:)