My hair tends to be oily so I wash my hair every after day but only on the front/ bangs part

My hair tends to be oily the next day I wash my entire hair so I wash it or just shampoo only on the front/ bangs and scalp part. Every time I shower, my hair is nice and all. But then, normally the next day, my bangs or front part of my hair is oily. Like, they would be greasy and be sticky but my entire hair are nice. And some time doing it, some built up idk dandruff in the middle of my scalp whereas I wash it suddenly exist and happens when I don't wash my entire hair. I don't know if it's bad the way I wash my hair? Is this normal? How do I make my hair less greasy? TYIA!