Finding mentos for supervising about my work

You'll want to google "Nimble Hand Tracking" to get started. There's a public github repo available here:

https://github.com/facebookresearch/hand_tracking_toolkit

High level overview: We use the inside out cameras to capture hand gestures / poses. The cameras operate in stereo which gives hand depth. Finger and hand occlusion is handled by an ML AI which has been trained on tons of poses to get pose estimation. This gives pretty accurate hand pose estimation even when there's incomplete information.

You can compare the Meta Quest 3 hand tracking against the hand tracking offered by Ultra Leap (formerly leap motion) - They use a mounted pair of IR cameras and an IR emitter to capture hand pose. I played around with their tech back in 2014-2015, so it had some pretty serious drawbacks (ie, can't operate on sunny days or with other environmental IR interference, extra cables, bad occlusion handling, limited FOV, etc).

You'll probably also want to play around with Unreal Engine 5 and explore hand tracking via the various plugins. I think there's a meta SDK offering plugin support, and there's also been a plugin supporting Ultra Leap (by Getnamo, if he's still around). You can look at the plugin source code in more depth to see how basic gestures were implemented. I'd treat it as a starting point for adding your own custom hand gesture support.