I am making a presentation about the importance of security and privacy and I need ideas for some simple showcases

Greetings everyone, first time poster here.

First of all, I've read the rules and I'm still not sure if my topic is valid. If not, please give me directions or another subreddit where I can find help.

Back in my college days I was very interested in DevOps security and security in general. Both my bachelor thesis and my masters thesis were security topics, but somehow I ended up in development.

Anyhow, I live in a small town and people here (let's be honest, also people in general) are not familiar with security, digital signatures, encrypting emails and so on. Because of that, I am planning to make a presentation in the town library about how to make yourself more secure and private on the internet.

In the intro of my presentation, I want to make 2 or 3 showcases of about how easy is to do something malicious, like send an spoofed email with a fake sender or see your password in wireshark if not using HTTPS; the idea is to make people aware that you don't have to be some kind of a leet haxor from CSI movies to do that.

Dear reddit, could you help me with some ideas? I will try my best to increase the awareness about security and privacy in my town, and hopefully (if people get more interested) in some larger areas.