Honestly, if you're just getting into 'Black Clover' fanfiction, the sheer amount of stuff out there is overwhelming, right? A lot of folks will tell you to head straight to Archive of Our Own, and they're not wrong. The tagging system is a lifesaver when you're trying to avoid things you don't like or find specific pairings. But I stumbled in there my first time with zero clue how to use the filters and got buried in a pile of crossovers and weird AUs.
I actually had an easier time starting on FanFiction.net, even though it feels older. The categories are simpler—just pick the 'Black Clover' fandom and sort by reviews or favorites. It's less polished, sure, and you'll hit some badly formatted fics, but finding the popular, foundational stories was way more straightforward for me. Sometimes you just want to see what everyone was talking about years ago, and that's the place to dig. I still go back for those classic, long-running Asta/Yuno rivalry fics that newer sites don't have as many of.