This members-only tutorial provides the steps to design a login page in Oxygen.
We shall ensure that the user does not get taken to /wp-login.php when logging in fails and instead show an error message on the same page.
Non-admin users shall be directed to the homepage after successful login and admins to /wp-admin.
Visiting the /login page when logged in will show a message that the user is logged in with a link to log out.
Screencast:
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Prevent redirection on failed login
Code: