I would say that river fishing can be more relaxed, you could easily fish the season with:
ptn, he nymph,black gnat, mayfly, klink, a reddish brown dun, little red sedge.
That list could possibly be halved.
More technical techniques have krept in like Cz nymphing, these can be added.
River fish are possibly more consistently catchable than still water ones.
Some rivers are practically impossible, one such has high banks, no wading, and shallow crystal water plus spooky fish. Not easy that one.
One thing is to not be daunted or over influenced by the literature. see a rise, cast a yard upstream, watch the fly drift over, wait a second or two - tighten.
Some streams the catapult cast is handy, that works quite well.