How to buy STEEM in Steemit?

Could you please explain the process of purchasing STEEM on Steemit in a step-by-step manner? I'm interested in investing in this cryptocurrency but I'm not familiar with the platform. What are the prerequisites I need to have before I can start buying STEEM? Are there any specific accounts or wallets that I need to set up? Additionally, what are the different methods of payment that are accepted on Steemit for purchasing STEEM? Finally, is there a minimum purchase amount for STEEM on Steemit, and if so, what is it? Thank you for your assistance.