Yes, using a safe and reliable VPN is very important not only when you go on crypto-currency websites, but always. Especially if you are using a wi-fi connection (wi-fi are quite easy to crack and monitor). So using a VPN will encrypt all your data, so that you'll stay safer. Unfortunately it's not so easy to find reliable VPN, I use mullvad and it's quite good, but there are lots of VPNs out there which is better to avoid. Fake services, slow ones and even the ones which spy on you. I hope decentralized VPNs based on blockchain technology will be implemented...