Since Ax 2009 - Ax2012 RTM, R1, R2 and R3, and R4 ahs 13 Cus then Ax 7, then D365 , d365 v8, D365 Unified interface v10 - the D365 platform is platform 31
its going to be a very long table...….new modules, refactored tables, new WMS, retail, call centre, new COA framework, advanced projects, process manufacture, lean, new ui, case management, end of layered code, more modules available without buying separately, Power apps, browser interface- the LCS tool set, its really a new product and new paradigm.
I suggest get a few days workshop with an experienced partner.
Go to the d365 site and start with the trial version, look at some of the you tube channels, and get stuck into the elearning portal and Docs help.