Chava's mitzvah of why do we hang a mezuzah on our door posts?

After I have been researching all about my mitzvot. I have learned a lot about why we hang a mezuzah on our door post. The reason is because it shows us that ה׳ is always watching. ה׳  is also brought down Angels from above and getting rid of out bad things that we have done. In the mezuzah there is parchment that had words written on it and it is perfect and the peters are perfect the spaces are perfect because those words that is in the mezuzah is everything that ה׳ said. If it is not perfect they have to start all over. What I will take into my life is that I will always know that g-d is protecting me and the home I live in. I will also continue to kiss my hand after I touch the mezuzah every time I go in and out of the room.

-chava