Best way to finger a women. For the vast majority of women, penetration is nice, but it's kind of like rubbing your balls - pleasant, but not going to make you come.
Spend plenty of time warming up before you move between her legs.
Plus, shorter nails just tend to feel better on vaginas.
Trim your fingernails, keep them clean and avoid having any cuts or lesions on your fingers.
Not to mention, a waterproof toy makes for easy cleanup once you two are done using it.
Of course, there are people out there who stigmatize lube based on an unrealistic expectation that all vagina-owners should be able to lubricate naturally at all times.
While rubbing your partner's clit, try taking your other hand out of their vagina and reaching up to caress their breasts or pinch their nipples depending on what they're into.
Once your hands are inside of your partner, you don't need to be actually fingering them or rubbing their clit for the entire sexual experience.
Meaning, every woman needs something a little bit different in order to reach the big O.