Start with the two TV series and watch them back to back. R2 picks up directly from the first season, and the fifty episodes together form one complete story with a real ending. If you stop there, you have not missed anything essential.
The three films from 2017 and 2018 cover the same events, but they are not highlight reels. Scenes were added, several plot points were changed, and the result is a separate continuity rather than a condensed version of the show. Those changes are what the 2019 sequel film, Re;surrection, follows on from — which is why the films sit in the same block as the sequels here rather than being treated as a recap you can watch at any time. If the sequels interest you, take the three films first. If they do not, you can stop after R2 with a complete story behind you.
One practical warning about this block: the three films were never dubbed into English. Everything else in the list has a dub, so if you watch dubbed, this is the point where you will need subtitles.
Rozé of the Recapture, from 2024, follows on from Re;surrection with a new cast in a changed world. It comes last in this path.
Akito the Exiled is a five-part side story set in Europe with an entirely separate cast. It assumes you already know the world, so it belongs after the main story rather than inside it, and it spoils nothing either way. It is placed at the end here because it is the hardest part of the franchise to actually watch — there is currently no streaming option for it in the United States.