Tips and tricks for the D.21

I created a document with some tips and tricks on using the D.21. You can find it here:
https://docs.google.com/document/d/1CLY0AkMPmpugwn9tQIpjFGMYqwmVBqGaHzQa80iSRgo/edit?usp=sharing

I'll update it sometimes, so keep an eye there.