Where can you buy IOTA?

Could you please elaborate on the various avenues available for purchasing IOTA cryptocurrency? As an investor, I'm keen to explore the different options to acquire this promising coin. I understand that the choice of platform might impact transaction costs, speed, and security. Could you highlight some of the top exchanges or marketplaces that support IOTA trading? Additionally, are there any specific steps or considerations I should be aware of before making a purchase? Your guidance in this matter would be greatly appreciated.