How to buy IAG shares?

Hello there, I'm curious about the process of purchasing shares in IAG. Could you please walk me through the steps I need to follow to acquire IAG shares? Are there any specific platforms or exchanges that I should be looking at? Also, what are some key factors I should consider before making an investment in IAG shares? Additionally, could you provide some insights on the current market trends and performance of IAG, and how they might affect my investment decision? Thank you in advance for your guidance.