During the water training portion of the training the students first lesson that had to be mastered was ...
My first lesson on a floatplane was getting into and out of the aircraft ... the next thing to learn was the whole complex sequence of pushing off from the dock, getting in, then starting the engine before we drifted or were blown into something expensive. Which is different every time because the wind is different every time. (I was taught to worry about trivia like putting on my seatbelt
after the aircraft was well under control and heading for a safe bit of water.)