Anyone have any guides or tips for how to decorate home living spaces to feel more "lived in"?

Hey everyone! Looking for any interior decorator aficionados out there. For as long as I can remember I've never been able to decorate spaces where I live and would love some advice!

I've been at my current home a few years and my living room is painted, but the walls are empty. We have some furniture (couch, entertainment center, key ring holder) and our TV but you really wouldn't be able to tell who lives there or what type of people we are. This is the case for all of our rooms.

Does anyone have or know of any guides/tips/suggestions for making a space feel more "lived-in" or "home-y"? I'm not sure where to start aside from family pictures, but then get stressed about messing up our walls or something "looking wrong" and having to redo/undo it all. Any way to get past that mindset as well is definitely welcome!

Any help is appreciated, thanks everyone!