How to create custom functionalities on submit to a webform - form-submit

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

Try the remote post handler. It can be found under:
webform -> settings -> email / handlers.

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