We like them since they get threat feeds from Talos, the world's largest threat feed service fed by the top security providers.
You can point your DNS settings to their IP's and you're done! This will give you the most basic protection. Give it a try, the OpenDNS nameservers are 126.96.36.199 and 188.8.131.52.
If you sign up for a family account you can get granular control of what category websites your family can browse to. Let's say to you want to block social media, just a few clicks and it's blocked. They even provide guides on how to configure your systems.
If you are lucky enough to run the newest Android version, now you can have SecureDNS without a VPN! Unfortunately it will not accept IP's and must be a DNS entry. For this we recommend Quad9.
Why quad9, because they protect from malware and other sites without configuration.