I’m interpreting this as fics that probably get talked about/referenced a lot, so here ya go! Also if you’re new, please definitely check out my Reylo FAQ. I don’t talk about it much, but it IS very helpful I think =)
It gets recommended a lot, but for very good reason, but Interstellar Transmissions by @ricca-raccoon and lovelythings is mandatory to be quite honest. It was one of the first big fanfics immediately after TFA, and it still to this day is iconic and basically a TLJ primer lol
Forms by @avenrue would be another one – it popped up literally 3 days after release of TFA and I remember gleefully dying all the way through January with it.
The Conviction of Things Not Seen is another early one that goes through the ‘what if’ of Ben Solo coming back to the Resistance. I don’t know if you’ll see it talked about a lot, but it counts as a stand out IMO.
The Moon, The Sun, and the Star Inbetween is another one thats pretty legendary/standout. Stays true to the dynamic of Reylo while throwing a kid into the mix 😉
Like Young Gods by Disasterisms is PADAWAN BEN SOLO GOODNESS.
IDK..there’s so many, I would just start there as they’re all AUs and I feel like that’s a good primer for fandom. Read my FAQ and it has others and my ff-rec tag =) Enjoy!