What are my favorite...
Are you are asking why I should post 'the ask'? Hunting around Google is not the way to go for the PICKit device database. We have spent nearly three years improving the quality of the PICKit device database. We receive PICKit device database updates from our users and we incorporate these updates and then publish for all to use - not just PICKitPlus users. I hope that some users are willing to share to increase the number of parts supported and further improve the quality.
Regarding learning resources - what do I advise? Trello ... where I have defined a training course for others - currently, been tested in Greece. I have also recently release 21 training videos on YouTube.
But, my best resource? It is Microchip. They have given both of the projects great support. I am co-developer of Great Cow BASIC and lead developer on PICKitPlus. Microchip provide resources in terms of access to the 8-bit business unit, direct 3rd level support, incident support and product support. Always very grateful.
I do give back resources to share. See
https://github.com/Anobium/Great-Cow-BASIC-Demonstration-Sources - this is just over 1400 example programs for 8-bit PICs and AVRs. They are updated and managed as we progress. My other gits are there also - specifically there is a PICKitPlus git where I share the current PICKitPlus parts database with all the older versions and resources.
I hope this gives you some insights.
Evan