Here is a virtual clinic on open water safety presented by chuckbeatty and the Long Distance Committee at their meeting last night. Nice resource for both beginner and experienced open water swimmers.
https://www.usms.org/fitness-and-training/articles-and-videos/videos/usms-open-water-safety-clinic
And here is another virtual clinic from last year.
https://www.usms.org/fitness-and-training/articles-and-videos/videos/open-water-virtual-clinic