Questions in Hollow Knight

So I got void heart before killing The Hollow Knight and I was wondering if I was still able to get the first ending or if I had to do it in a new save file

Anyone know a good way to farm Geo? I’ve done almost everything possible before Kingdom’s Edge besides getting the Vessel Fragment in Ancient Basin and upgrade the Fragile Charms. I’ll give a sticker to anyone that gives me a good method. Thanks!

Ok cool but who the hell is this person anyways. I made a fanart of her (literally the photo you are looking rn) and idk who is she

Any charms I should use for vanilla radiance?

I'm tryna get the voidheart ending

I am trying 112% the game first try and i am stuck on the watcher knights, any charms or techniques for fighting them

(BTW already got the chandelier)

which is harder to beat?

Where do you think the knight stores geo

Is grubsong any good? bc I feel like it is