Redirect after login

add this to your functions.php, it will redirect the users (who can’t manage options) to the home page of the website instead of the admin panel.

add_action('admin_init', 'no_mo_dashboard');
function no_mo_dashboard() {
  if (!current_user_can('manage_options') && $_SERVER['DOING_AJAX'] != '/wp-admin/admin-ajax.php') {
  wp_redirect(home_url()); exit;
  }
}

source: https://werdswords.com/howto-disable-access-to-the-wordpress-dashboard-for-non-admins/