I have designed html page. How to validate login page?

Question

I have designed login page with html. if i enter credentials if it doesn't match against database then it should show error message in login page like invalid email or password.(no pop up). for this should i code in html or in back end. please provide me code. 

And if credentials match it should redirect to next page is landing page how to show welcome message with  firstname lastname(already stored in thee databse) using html code.?