Is Hollow Knight: Silksong really the kind of game you need to farm? It's a fair question, but having lost 1,000s of Rosaries to bosses, environmental hazards, and even just plain old enemies, I say yes—why not get some currency and buy some upgrades you can enjoy versus slaving away to gather a few beads that you'll likely lose to the next big bad.
While you can farm a fair few Rosaries in Mosshome by running back and forth between the bench on the left side of The Marrow, and in Deep Docks, this farm is located in Act 2 in the Choral Chambers, and will net you basically everything you need in a pretty safe way. If you're not in Act 2 yet then look away now, or come back later when you are. When entering the Choral Chambers (after you've purchased the map), instead of heading straight up, you'll want to head over to the right and climb that side instead, making your way up to the First Shrine structure in the far top right.
