The only way to learn this seems to be by doing it.
Karel Jr says in one of the videos that he detects a pattern in the ocean pretty soon after the start of a race.
I can imagine that there is such a pattern, and what it could possibly be like, but as I do not see it, I don't know.
Is there something like a 'beginners guide' to learning how to read the water, iow what advice can experienced paddlers give to beginners - what should we be looking for ?