This is a classic Steemy episode re-uploaded to the DTube platform. Steemy, still in his old-school design, explains how voting and voting power correlates. The tool used in the video to present your voting power is SteemNow. Nowadays I use SteemWorld instead.
The first six minutes are still valuable today. You can skip the final two minutes as they have become outdated, though.
▶️ DTube
▶️ IPFS