I am new with Drupal 8 coding and I need some guidance on how to create custom web form with your own submit functionalities that checks in the db with all field match and redirects to another page.
I have tried creating the form but i do not know how to start with creating own submit operation.
I have name, email and case fields in my form with submit button and my db is dr-sp-students with column id,name,email,case