Where can I buy Oasis protocol?

Could you please guide me in finding a reliable platform or exchange where I can purchase Oasis protocol? I'm new to the cryptocurrency space and am looking for a trusted source to make my first investment. Are there any specific requirements or steps I should follow to ensure a smooth transaction? Additionally, what factors should I consider when selecting a platform, such as fees, security, and availability in my region? Thank you in advance for your assistance.