WOW Hollow Knight fans! --First time player

Speechless..... I have had this game for FOUR years sitting in my backlog. Finally started playing it last week and I already have put in 25 hours. Hollow Knight is LITERALLY the Elden Ring of Metroidvanias and I dont really care for that genre. The game is SO good that after buying Resident Evil 9 Requiem last Friday at WalMart, I have put in less than an hour in RE9. I just keep playing Hollow Knight.

I do have a few quick questions though. I saw the flower quest but I saw that you cannot get hit even once so I reloaded before talking to her and went to go do other things. I actually just got the dream nail teleporter so my question is, can I go to the end, place the teleporter then go get the flower and teleport? I know she said I cannot use the bug to fast travel but she didnt say anything about the dream nail teleporter.

Second, after I beat Hollow Knight, I am buying Silksong. How much harder is Silksong than Hollow Knight? I heard horror stories from people when the game came out. Scares me.

Another question. I have exactly 1197 "Red Dream Circles" (Sorry forgot what they are called) and I am wondering if there is a place I can just get 3 easy? So I can turn in 1200 to the NPC.

Last, I have 8000+ Geos and I am constantly SCARED to lose them. I have bought all the charms and charm slots I can right now (I need to find one more charm to buy the last 1400 charm slot from the NPC). What can I spend this on? lol -- Only thing I can buy right now is my "fragile" charm from Divine, but that is 12,000 geos and Im not 100% sure that is worth it? What do you think?

Thanks for the help! Love the game guys!