Facebook's algorithm should mostly do this by default. If you don't interact with people's posts, you'll see less of them.

You can explicitly mute people as well or even just certain websites. My aunt has been posting a ton of weird alt-right news lately and I've had pretty good success by just blocking her news sources so I can still see posts from her that I care about (family stuff.)

I also have a few friends who I've muted entirely because I still want to be able to contact them, but I really don't care about any of the stuff they're posting to facebook.

This might be a little more manual than you want, but it's pretty simple to just casually block posts you don't like as you scroll through your feed.