Is My PHP OOP Code Following Best Practices? Looking for Feedback!

Hey everyone, I'm working on a test project in PHP and trying to follow good OOP practices. I've separated my concerns using DTOs, a repository, and a validator, but I want to make sure I'm on the right track. Here are a few things I'm wondering about:

• Am I structuring my classes correctly (e.g., DTOs, Controller, Repository)?
• Is my validation logic in the right place, or should it be handled differently?
• Any improvements in terms of error handling and data transformation?
• Other best practices I might be missing?

https://github.com/richard9004/TvSeriesApiApp/tree/master

I’d love any insights or suggestions from experienced PHP developers!