Most important thing to take away: be aware of your environment and the people around you. If a person makes you feel uncomfortable for some reason---listen to that feeling. Those feelings are called your inner voice (some people call it intuition and/or Holy Ghost)---these feelings will not mislead you.
I remember a couple years ago I was running late for a meeting. I got to the meeting late and so I had to take the seat that was left open. I sat next to a man, who was dressed like all the other men in the meeting and was he clean however I had this yucky feeling sitting next to him. I had a feeling and thought run through my mind that this man was a pedophile. Because everyone in the meeting was wearing name tags I looked up his name (using my cell phone) on the sex offender registration and I found him.
Our inner voice/intuition/Holy Ghost is there to protect us and our families---pay attention to it