what hair products do you guys recommend??

im filipino with relatively thick straight hair and i have no idea what products to use, i dont mind spending more for it but £20 quid per product at a max
my issues are that i get like little dandruff around the top of my head and if i touch my hair it gets pretty greasy on day too (i think thats inevitable but if theres a shampoo that prevents it im all ears :)
thank you!!