Here’s a link to a great description and dry land drill for Freestyle Tempo, High Elbow Position and Catch by Mark Evans.
And this one has some phenominal Breaststroke by US swimmer Ed Moses. Keep watching after the short course race with Kitajima … the 200m 2:02 is unbelievable.
And some beautiful Backstroke swimming in slow motion … note the selection of suggested clips beside this one.