What do I do?

Alexa and I have the sin offering, and while learning we came across some things that were a little confusing. We read that if a person swears and then he breaks it unknowingly, he must bring a sin offering. We also read that if a person sees someone commit a sin and they do not testify, they shall bear it for a sin. We focused on understanding what this meant and it became quite clear to us.
However, I want to challenge you and see what you think this means! I can post the answers after you comment if you would like, but you might actually get the answers to begin with! If you want more challenging and stimulating questions, ask, because Alexa and I have a lot to discuss!
Good luck!

Challenge Round: 2 Bonus Questions!

• Up until Vayikra, the Torah is mostly narrative. Sefer Vayikra is different because it contains primarily mitzvot and very little narrative. However, Sefer Vayikra does contain two interesting narratives. What are they?
• Show how the parshiot progress in topical order and not chronological. Explain why the 2 narratives belong in this sefer.
  

*Hint- for further reading go to http://www.tanach.org/vayikra/vayik/vayiks1.htm
This is actually an interesting article, not at all dry and boring. I actually read it, so you can too! It was very easy to read through.