Terry covered issues that have affected a few in running their WordPress website. He demonstrated what to do if you have an update go bad and lock you out of your site. Bulletproof Security was discussed and used as an example of an update not completing completely and causing problems. He covered permalinks and introduced the P3 plugin to check for resource hog plugins. He then covered custom menus and how to set them up.
Link to P3 plugin: https://wordpress.org/plugins/p3-profiler/