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 If you are new to the language, this tutorial is not for you. This tutorial is aimed at people who have grasped the basics of PHP and know a little bit about object-oriented programming.
 
-You should at least heard of [SOLID](http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29). If you are not familiar with it, now would be a good time to familiarize yourself with the principles before you start with the tutorial.
+You should have at least heard of [SOLID](http://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29). If you are not familiar with it, now would be a good time to familiarize yourself with the principles before you start with the tutorial.
 
 I saw a lot of people coming into the Stack Overflow PHP chatroom and asking if framework X is any good. Most of the time the answer was that they should just use PHP and not a framework to build their application. But many are overwhelmed by this and don't know where to start.