I've been online since before I was 12 using chat rooms, many forms of social media, online banking, online investing, learning, and teaching.
Professional teacher for over 14 years.
Mentor for over 12 years. (Mentoring since I was 17).
Youth leader and teacher for over 21 years. 
I have mentored kids at all ages, from 3 years old into adulthood.
I have taught internet safety for my entire professional career in addition to regular curriculum. 
I have taught internet safety to all the kids I have mentored. 
I have done professional development sessions at work, showing them how to teach internet safety.
I have taught parents internet safety to help keep their kids safe online and in-person. 
I teach my 2 teenage sons how to stay safe online and monitor their online activity. 

These are a lot of sources that parents can use to further educate themselves on this topic and share with their teens. It is impossible for me to cover every single bit of information on this topic, so I have included these helpful and informative sources as like a one-stop shop for parents on everything related to internet safety. 

National Suicide Prevention Hotline: 800-273-8255
Crisis Hotlines and Resources: https://www.apa.org/helpcenter/crisis
https://www.cybersafetycop.com/understanding-how-online-predators-operate/#:~:text=These%20are%20some%20typical%20methods,in%20their%20targets'%20personal%20profiles.
https://www.webroot.com/us/en/resources/tips-articles/methods-of-online-predators
https://www.understood.org/en/friends-feelings/child-social-situations/online-activities-social-media/9-ways-to-protect-your-child-from-online-predators
https://edu.gcfglobal.org/en/internetsafetyforkids/staying-safe-from-online-predators/1/
https://deliverfund.org/blog/10-ways-internet-predators-groom-children-online/
https://internetsafety101.org/grooming
https://childrescuecoalition.org/educations/investigator-shares-6-steps-predators-take-to-groom-kids-online/