Countersteering and roll are not mutually exclusive. The countersteer generally happens when steering whether you think about it or not. If you know about countersteering, you can practice it to make emergency turns.
For roll, Leaning in the direction of the bike is actually a bad habit (but it'll be fine on most road turns)
It turns out you want to lean the bike, and lean/shift your body in the opposite direction. This keeps center of mass above the wheels.
For example, the pro motorcycle racers with their knee an inch off the ground,they're leaning their body weight away from the turn, away from the ground. Meanwhile their bikes are leaning crazy hard.
That style of leaning is important for fast descents, or switchbacks, particularly switchbacks. Eg: "MOUNTAIN BIKE TIPS: CORNERING WITH CONFIDENCE" (start at 1:45) https://youtu.be/GFKPtEzE4xw
For roll, Leaning in the direction of the bike is actually a bad habit (but it'll be fine on most road turns)
It turns out you want to lean the bike, and lean/shift your body in the opposite direction. This keeps center of mass above the wheels.
For example, the pro motorcycle racers with their knee an inch off the ground,they're leaning their body weight away from the turn, away from the ground. Meanwhile their bikes are leaning crazy hard.
That style of leaning is important for fast descents, or switchbacks, particularly switchbacks. Eg: "MOUNTAIN BIKE TIPS: CORNERING WITH CONFIDENCE" (start at 1:45) https://youtu.be/GFKPtEzE4xw