Hello, this is probably a dumb question, but I recently saw this thing online about cardboard having "forever chemicals" or something, and it scared me, because we have some in our garden. When my dad had set up our garden areas, he put a layer of cardboard, underneath the soil, I think to reduce weeds or something, idk how it works really.

I've heard cardboard is fine in compost, so I figured it was fine in general. Mostly I don't really get why cardboard is used, to keep weeds out, because won't it degrade relatively quickly in the soil? Maybe it's for another reason and I don't get it. But anyway, I'm worried now that there's some sort of bad chemicals in the garden now. I think it was just regular cardboard, not glossy or whatever, and the info I saw online was conflicting about whether or not it's bad, so idk what to think. Probably I'm just being paranoid, but is it bad to use cardboard in compost or soil?