CSS and JS Files aren't loaded - CiviCRM 5.18.2 & WordPress 5.2.2
I'm with Demerit - it looks like there's a mismatch between your Resource URL and your base directory.  Check your $civicrm_root in civicrm.settings.php.  Ensure that it is a) correct, b) doesn't contain a symlink.  If it contains a symlink, rewrite the path to be whatever the symlink(s) resolve to.