Hey Nick,
One of the things that the Covid pandemic forced me to do was to record my lectures for various classes. So, if you want to dig deeper into meter, you could check out this presentation
HERE.
It should autoplay as you click through the slides. I think it takes about 45 minutes, and it should give you a good basic grounding in syllabic, accentual, and accentual-syllabic meter, as well as questions of flexibility/substitutions.
Enjoy, Tony