All my input will be related to baitfishing, generally on bottom or floated up slightly off the bottom.
1. How long have you river fished?
10-15 years
2. Who taught you? Have you taught anyone? Kids, friends, etc, for example.
Grandpa, Dad, Friends. I have taught a lot of people, specifically with respect to carp fishing, which is unique.
3. Any differences from fishing a lake, for example?
Yes, often you must use a heavier sinker, depending on current. Sometimes you must cast out a good distance to find the depth you're looking for (generally riverbeds have channels, and often the best fishing is just up from the edge of a channel/shelf). Fish generally head downstream once they're hooked, so try not to fish upstream of snags or other potential debris. Also insure that you're far enough upstream of any fishing partner, so you don't end up tangling with eachother once a fish is on.
4. Types of fish you fish for in the river?
Carp, Catfish, Buffalo
5. Types of lures, etc most often used for fishing the river.
Often live minnows/shad, cut bait, flavored baits fished with a hair rig (specifically for carp)
6. Particular skills/tips you've learned?
A lot from 3 above probably applies, but also when bottom fishing or any fishing where chumming is involved, river fishing requires greater amounts and more frequency as current spreads your bait downstream.
7. What it means to you? Income, hobby, food, etc.
Hobby only