Write a sample transition for each of these three scenarios:

1. For the transition between the intro and first point: You are transitioning between the intro and your first main point (which is what herd immunity is).
2. For the internal summary and internal preview between your first two main points: Your first point was about what herd immunity is and your second point is about the benefits of achieving herd immunity
3. For the transition between the last point and the conclusion: Your last main point was about the benefits of achieving herd immunity and you are transitioning to the conclusion