How much does it cost to buy Bitcoin on Kraken?

Good day, financial experts. Could you kindly elaborate on the expenses associated with purchasing Bitcoin on the Kraken platform? I'm particularly interested in understanding the transaction fees, if any, as well as any additional costs that might be incurred during the buying process. Additionally, is there a minimum purchase amount that one must adhere to, and does this minimum amount vary based on market conditions? I appreciate your assistance in clarifying these points as I navigate the world of cryptocurrency investments.