Where can I buy Shield protocol?

I'm interested in investing in the Shield protocol, but I'm not sure where to start. Could you provide some guidance on where I can buy it? Are there any specific exchanges or platforms that support the trading of Shield tokens? Additionally, are there any particular considerations I should keep in mind while purchasing, such as fees, security measures, or any potential risks involved? Your expertise in the field of cryptocurrency and finance would be invaluable in helping me make an informed decision.