Reactive Forms - setValue, patchValue And valueChanges

Reactive forms are completely different as compared to template-driven forms. Here, we create form structure first, before we jump into HTML code and it helps to separate components models with help of controls and group for easy understanding and targeting to fulfill the specific model operations.

source https://www.c-sharpcorner.com/Blogs/reactive-forms-setvalue-patchvalue-valuechanges