I am a thirteen year looking for help about her hygiene?

Well you kno how a vagina is usually smells during a period. mine doesnt is smells fresh, but when im not on it doesnt. it smells like a water based liquid. its not that bad but its wierd. and my discharge smels lik onions. also how do i shave down ther with out getting razor bumps?. and i sweat alot. i sweat almost everywhere i sweat under my arms, forehead, back shoulders and legs can you tell me what i should do about that. if theres anything else that you think i should know to keep good hygiene please tell me.