Hi LadyDay! Welcome welcome.
I'm not the most knowledgeable about dandruff, but it happens to most people. I've used the shampoo Sulphur8 when I have had a bit of dandruff years ago. I guess I can't complain about it, I picked it because I heard Sulphur is good for your hair, bit I didn't notice any benefit aside from no dandruff after a week.
As for oiling hair, no it is not nessecary, especially if you feel your natural oil is sufficient for your hair. But so many long hairs swear by ROO (rinse out oil), because the right oil will protect and condition your hair without looking greasy. I never use coconut oil because I hate how heavy it is, but jojoba oil is a completely different story, because it's much lighter. I usually prefer just oiling the very ends of my hair when they're in a tussle from a braid, rather than my scalp. So there's lots of ways to oil or not oil.
Finally, I like Sarah Ingle's YouTube videos. She explains everything clearly and generally has good advice. I also love TorrinPaige's YouTube, where she shows off how to do a lot of different hairstyles.
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