Having correct crosshair placement will limit the aim needed to hit a shot. The distance moved from "A" to "B" is the aim, "CP" is making sure that "A" is as close to "B".
Many players forget that time is a tool you can use, when only 30 seconds is left of a round, learn to make that your advantage.
Rainbow 6 is half gun play and half gadget use, knowing how a team is setup and what to look out for will help you a lot.
Default cameras, common drone spots - and knowing where the bombsite is before the preparation phase ends - gives you a good start to the round.
This is how I warm up - 5 rounds of headshot only slow and accurate - 2-3 rounds of speed (as fast as you can go!).
Here we'll look at pro player "Redeemer" take note of how he guides his teammates around the map to flank at the perfect time.
From a coach/analyst point of view, eye tracking is great as it gives us some Intel that until now was impossible to get, knowing what your players are looking at makes it much simpler to break down mistakes and find improvements.
This is a simple basement attack on bank, where we see a quick roam clear, setup and a rotation before the execute.
The Game Plan