Multi Step Form using Angular Reactive Forms and Angular Material

I developed the multi-step form project using Angular Material and Reactive Forms. Building the project was a rewarding experience, but I faced challenges in managing the complexity of the form across multiple steps. Ensuring smooth navigation between steps and maintaining form state presented initial difficulties.

While the majority of the code is clear, I have some uncertainty about the general structure and best practices for handling form validation and error messages efficiently. I'm also curious about optimizing the performance of the form as it scales.

Are there recommended structure and best practices for managing complex forms in Angular, especially when it comes to handling form validation and improving overall performance?