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It really depends on your location, depth of the river, and what gear you already have.
In general, look for areas in the river with eddies or spots where there is a steep/deep drop-off. Trout and Smallmouth tend to feed in areas like that.
For river fishing, I prefer flies or anything with a spoon on it as bait. Live local bait you find on the banks also works really well like crawdads, fly larvae, etc.
Good luck anon