They hide your browsing from your ISP (and probably your government)
They hide your origin and substitute another for web sites.
I'd say a VPN is only useful to people engaging in crime, or things that look like crime and those buying services that are priced differently around the world
That provide no protection against things you might click on
But some VPNs do provide you a little protection on things you might click on. Ublock and not being a dummy will get you around most of that use but for general users it is more safe.