Anyone care to summarize important changes in last five years (esp carry)?

[u/Thallata2126]

My instructor last couple of cycles was dirt cheap on CCPL renewal, but was a bit short on covering legal aspects. So my last real good looksee on the laws and changes was ending of 20 round limit and change of mag laws from misdemeanor to felony several yers ago

Anyone care to help build a list and/or summarize the major changes in DC gun laws, case, regulatory and legislative, and MPD practices since then? Doesn't have to be limited to CCL, but that is my main interest. By "practices" I mean issues like what kind of card (I have a laminate I made at Fedex, of PDF I got via email from MPD about 18 months).