Where can you buy BNB?

Could you please elaborate on the question, "Where can you buy BNB?"? I'm particularly interested in knowing which platforms or exchanges offer BNB tokens for purchase, as well as the steps involved in the purchase process. Additionally, I would like to understand any specific requirements or considerations that need to be taken into account when buying BNB, such as account verification or trading fees. Could you provide some insight into these points, please? Thank you.