I've started a weekly video series about MIDI. As it is such a big topic, I'm producing segment series on various areas. I started with SYSEX and have now moved onto NRPNs.
I'm hoping this will help out some of you who find it a little tricky.
Here's the video released yesterday on NRPNs:

Follow the links on my channel to the playlist for the rest of the videos, and don't forget to subscribe so you don't miss out on the future releases.
Give me a shout out on my channel, and let me know that you found me here! Also, if you have any suggestion on stuff you'd like me to cover, please let me know!
Enjoy!