When we talk about a cornering line, we usually break it down into three parts: the turn-in, the apex and the exit. In reality, of course, the corner is one long curve. But thinking about these three areas separately is useful, because each is treated differently.
The turn-in point is where you countersteer, change direction and begin banking. How long this turn-in phase lasts depends on how quickly you can steer the motorcycle. The quicker you turn, the sooner you can settle into a stable state.
The apex is the tightest part of the corner where you are travelling slowest and banked over most, before accelerating out. Usually, the apex will be where you are closest to the inside of a corner.
Your corner exit begins from leaving the apex. From here, you start to get the bike upright, allowing you to progressively apply more power and accelerate away.