Welcome to Moodle Sandesh, and it is sometimes a wild ride..
You will find a lot of information about every aspect of Moodle directly from the page in your Moodle. At the bottom of each page is a link that connects to Moodle Docs, help files if you like, that informs you about that page. If you can't get where you want to go, then log into a Forum and click the Documentation link in the menu above and that will take you to the main page of all the documents relating to Moodle. The page you specifically want to look at here is this one, click the link and it will get you there.