How to buy ast?

Could you elaborate on the steps involved in purchasing AST tokens? I'm interested in investing in this particular cryptocurrency but am unfamiliar with the process. What are the prerequisites I need to fulfill? Should I have a specific cryptocurrency wallet or exchange account? Are there any security measures I should take to ensure a safe transaction? Additionally, what are the fees associated with buying AST, and how do they compare to other cryptocurrencies? I'd appreciate a step-by-step guide to purchasing AST safely and efficiently.