Best base routine before foundation?

I know they say to always moisturize before starting your makeup routine, but sometimes it just doesn’t turn out as “clean” and sometimes becomes almost cakey looking, even though I go very thin layers of foundation.

Does anyone use a specific type of skincare product, like a face serum or exfoliator before moisturizer…
In my late 20s but still have trouble applying makeup, and havent really found my go to routine yet unfortunately.