The US Military has some quite excellent, and approachable, guides to improving your safety online. These are all accumulated on their fact sheets page. In particular, the Identity Awareness, Protection, and Management Guide is very friendly for the non-technical. It’s a goldmine of handy visual references on how to configure everything from social media to WiFi networks and dating websites. I highly recommend going through and taking their advice as far as locking down the social networks you use and locking down privacy settings on your phones.