Getting Help with the man and info Pages
As you explore Linux, you will see many commands, system files, library functions, and other special files that you don't understand. Your best and first reference when learning a new aspect of Linux is the set of man pages (short for manual pages). The man pages are the best way of discovering every possible variation and option that you can use with a command. They tend to be long and complicated, because they serve as a complete reference. However, even beginners can benefit greatly from them. Usually, if you read the first couple of paragraphs of the description, you can get a good idea of the topic.
Another reference is the info pages, which are somewhat newer than the man pages. Info pages also tend to provide more description and explanation than do the man pages.