How can I use BitPay?

Hello there, I'm interested in learning more about how to use BitPay. Can you please explain to me in simple terms how I can get started with this cryptocurrency payment processor? I'm particularly curious about the steps I need to follow to set up an account, accept payments in Bitcoin, and how the transaction process works. Additionally, I'd like to know if there are any fees involved and if there are any limitations to using BitPay for my business. I'm hoping to integrate this service into my online store to offer more payment options to my customers. Thank you in advance for your help!