Send Logged-In Users Away From the Login Page
When someone who is already logged in opens wp-login.php, they go straight to the dashboard (or the homepage for subscribers) instead of seeing the form again.
Snippet Library
Login snippets for WordPress
Snippets for the WordPress login page and the way people sign in: your logo and colors, a custom redirect after login, friendlier error messages and limits on who can get in. For anyone who wants a branded, safer login without another plugin.
Use a Custom Page for Logging In
Sends visitors who open wp-login.php to your own login page (for example one with the login form shortcode), and back there when a login fails.