Clientele App

I am developing a clientele App. The issue is how should I stop other clients to edit and delete data of others. And how should I give the admin the authority to perform all these task?
Can anybody share video explanation if possible

You can place a condition on the edit screen to only allow editing if the email in that row is the signed in user. You can also add a condition to allow Admins to edit.

do I have to include admin and email in every sheet for this to work?

You just need to make sure you are writing the email of the signed in user whenever you add a new row. Then set the condition for editing to check if Email is Signed in User OR User Profile → Role is ‘Admin’.