What does it mean that a substitute teacher has the opportunity to be transferred? How can you still be a regular teacher while serving as a substitute?

Nowadays, teachers are openly recruited, which is the same as taking the exam for public institutions, so it is difficult to directly switch from a substitute teacher to a full-time teacher without going through the recruitment examination. However, if your local area has special care policies (for example, recruiting regular teachers from substitute teachers), that is also possible. But you still have to pay attention and be sure to say hello. After all, there are too many substitute teachers, and the pay is not good. If you can't pass the exam, you won't be able to become a regular teacher