A plain "Right 4" is easy. But rally stages aren't plain. Here are the most common modifiers Phil will shout:
Reading a guide is one thing. Having a reference on your phone or printed next to your wheel is another. dirt rally 2.0 pace notes pdf
The most common confusion for new players is the number system. In most rally games (and real life), A plain "Right 4" is easy
A very sharp bend; requires significant braking and low gears. Almost a hairpin; requires very low speed. Square A very sharp bend