Where should place for the custom interfaces and classes

General Architecture, design, OOP
1

Hi!

I’m beginner in Yii2. I couldn’t found information by my question. Tell me please, where a better put my interfaces and classes they shouldn’t declare as components?

2

To custom directories/namespaces that correspond to your classes and interfaces meaning.

3

Hence I can create my own directory anywhere in within the yii installation. Right?

4

Yes.