How can I fix checkout errors in my online store?

[Herbal1]

Hello,  I'm having major issues when it comes to setting up my store. I am having major trouble with customers checking out it keeps giving an error message. Are you able to help me or give me pointers on how to fix the problem?

[PaulNewton]

Always provide relevant context so others can understand, inspect or reproduce issues.

Keep always in mind others do not see what you see or know what you know either on shopify or in life.
Provide links, screenshots, reproduction steps, etc etc. Make sure any links are publicly accessible  by testing in an incognito window to see how another person would encounter it.

Goodluck.