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Info' is the Help browser in GNU Emacs. Think F1.

M-x info-apropos
Don't know where to go. Try this command. For example, try M-x info-apropos RET compile RET to get some overview of compilation support in Emacs. For those people who want to work, before getting degrees.
[C-h r] (or M-x info-emacs-manual)
Learn how to use GNU Emacs. For those people who want to get degrees, before starting to work.
[C-h i] (or M-x info)
See what manuals of all packages that come with your GNU Emacs
While in an info buffer, jump to some topic of interest. To learn about regular expressions try [C-h r] and {{Keys|i regular TAB}.
Same as [i] but gives you a list of links.
For the navel gazers. You are lost and overwhelmed by the amount of information available and you want to reflect on where all you went and how you got lost.
[C-u C-h i]
You have installed a Third party package. You have created an info file with make info' and want to browse the info file without much fuzz. You can M-x customize-variable RET Info-directory-list if you can get around to it. But it will take some time.