Links are so much of what the web is about and how it is put together. A strength of WordPress is that it simplifies and automates the process of creating links within your site and to other sites.
Whether you need links grouped at the top or sides of your pages, the Menu setting (Appearance > Menu) is where you will go in the WP Admin to set those up.
But Links in WP is more then setting up your Menu.
Note: You will need to create an account and login to see topics 1, 2, 5, 6 and 7.