This is a guide on how I upgraded my site from 7.15 flat, all the way up to 1912. I also included moving off 2012R2 to 2016 DDCs with some troubleshooting situations you might run into. I covered the basics of upgrading licensing, DDC upgrades, Storefront upgrades with NS VIP configuration, PVS upgrades, WEM upgrades, VDA upgrades, and some re-configuration ...