>>753744It's a lot simpler than you think. There's no master grand timeline like Metal Gear Solid or something, because each new entry is its own self-contained world made by a different director based off of the manga.
You can either:
-Watch the original 1985 movie and the sequel to that, Innocence.
-Watch Stand Alone Complex season 1 and 2 and Solid State Society.
Then, if you liked it, you can watch the other thing.
And then if you still want more, you can read the manga or watch Arise.
Arise is where it actually gets complicated if you want to watch it. Because you'll want to watch the original 4 OVAs and then the last two episodes of Alternative Architecture. Then you can watch the 2015 movie which is a sequel.
That should hopefully cover everything relevant. If anything doesn't make sense, just ask. The image provided should help give a little more context.
There's also the American live-action movie which was just okay and the upcoming Netflix anime which may or may not suck.