Unfortunately, all guides I know of are still pre-expac/level 50 guides. However, I generally recommend Xenosys's tanking guides. Even if it's a bit outdated they're still useful... you'll just have to adapt to include Heavensward abilities until the guides catch up.

And, and absolutely get provoke crossclass. It's mandatory for tank swaps.

edit: Actually as I look at that video again, there's a 3.0 (expac) video guide linked to right at the start of the video. Click that and you should be good to go!