This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
It depends on what content do you want to put into the outputLink. In your example, there is no need to include verbatim. But if you want to include html code, of jstl or other things, you have to you verbatim. You can think to verbatim like a container which helps you to put something into the JSF control hierarchy something which is not JSF.
Failure to use the verbatim tag can result in the items in question either being rendered in the wrong place on the page or not at all. Since the JSF page is constructed from a directed graph of elements, the verbatim tag provides an "element" where one would otherwise not exist.
The need for the verbatim tag is reduced in more recent versions of JSF and when you're using the Facelets framework, but it's still occasionally necessary.
An IDE is no substitute for an Intelligent Developer.