How to buy Tezos?

As a curious investor seeking to diversify my portfolio, I'm wondering about the process of acquiring Tezos. Could you please explain the steps involved in purchasing this cryptocurrency? Firstly, what platforms or exchanges are recommended for buying Tezos? Secondly, how do I ensure the safety of my transactions and avoid any potential scams? Additionally, what are the associated costs and fees that I should be aware of? Finally, is there any advice you could provide on the best time to buy Tezos, considering its market fluctuations? I'm eager to understand the entire process to make an informed decision.