When developing with Yii you will be writing code in an object oriented fashion, so make sure you are familiar with [Classes and Objects](https://secure.php.net/manual/en/language.oop5.basic.php) as well as [namespaces](https://secure.php.net/manual/en/language.namespaces.php).
and understand its [guide](https://getcomposer.org/doc/01-basic-usage.md). If you are not familiar with using command line it is time to start trying. Once you