Some tips I’ve learned:
Wash your hair twice, I don’t know why this works but it does. If your shampoos cheaper, like Suave, you’ll have to do it everyday. Otherwise every other day will be alright, unless you’re particularly oily (then you should look into shampoo for that). Please brush all of your hair, if you don’t it can get permanently matted (・Д・) Start at the bottom, and section it out if that’s necessary. It’ll take a while but it’s worth it. If it’s already matted some salons can get it out, if it’s truly unfixable they’ll at least be able to give you a good haircut. Also, if you really can’t bring yourself to wash your hair often enough, dry shampoo can help for a day or two but isn’t a permanent solution
Haircare aside, you should try to carry deodorant with you (put it in your purse/whatever you carry). There’s mini versions if you’re worried about space. Perfume is less important, if you want it just spray it on in the morning and forget about it. I know it seems like perfume would cover it up when you don’t shower/wear deodorant, but it absolutely doesn’t. I’d also recommend putting on lotion before bed or after showering. I use Nivea because I have super dry skin, but if you don’t wanna smell like a grandma that strawberry Korean lotion is pretty good
Sorry if there’s any typos in that.. tired today and too lazy to proofread ヽ(；▽；)ノ