The man command is without question the number one learning tool for how to utilize the command line interface and get the most out of it. Reading a man page is often the best way to learn how to fully utilize the tools available to you. Manual pages are available for nearly every command and is a valuable resource for anyone wishing to learn more about the command line. One of the wonderful things about Linux is that if you are willing to learn, you can have your Linux teach you by using the man command!
Here is a manual page invocation for the ls command, the general syntax for the man command is “man <program name>”. Learning Linux can be fun when you can find the information you need to do the things you want to do. A man page will tell you what the syntax for the command usage is as well as common usages of the command. It will also tell you every flag with a description of what that flag does.