I have been watching WordPress TV videos for a while. Some are over my head, but there are snippets of value to pick up even with the very technical talks.
This particular talk is easy to follow and very watchable. And it doesn’t just relate to WordPress sites, although Brennen Byrne does talk about them too.
Here’s the link to WordPress Security on WordPress TV.
And here’s the link to the WordPress security checklist on Brennen Byrne’s Clef site.