“Fastest” VPN – Many VPN services claim to be the “world’s fastest VPN.” Of course this is just marketing, with most VPNs having very mediocre speeds (usually because their servers are overloaded with users – see the NordVPN review for example).
Be “Anonymous” Online – The reality is that you can never be 100% anonymous online. A VPN service could still see what you are doing if they wanted to, because you’re using their server network. Furthermore, it’s very difficult to be “100% anonymous” with anything, simply due to all the developments in tracking. But if you want to get as close to anonymous as possible, use a multi-hop VPN chain, along with other best privacy practices.
IP address “leak protection” features – Lots of VPNs promote various leak protection features that don’t actually work. The only way to verify the features is to run the VPN through a variety of tests and checks.