Here are some common issues that merchants may encounter when using Shopify, along with possible solutions:

1. Login issues: If you are unable to log in to your Shopify store, try resetting your password. If that doesn’t work, try accessing your store using a different web browser or device.
2. Website downtime: If your website is down or experiencing technical issues, try accessing the Shopify status page to check for any known issues. You can also reach out to Shopify support for assistance.
3. Payment issues: If you are having issues with payments, make sure that your payment gateway is set up correctly and that all required information is entered correctly. You can also check to see if there are any outages with your payment processor.
4. Email issues: If you are not receiving emails from Shopify or your customers, check your spam or junk folder to see if the emails are being filtered. You can also try whitelisting Shopify’s email addresses to ensure that you receive important notifications.
5. Order fulfillment issues: If you are having issues fulfilling orders, make sure that your shipping settings are correct and that you have sufficient inventory to fulfill the orders. You can also try using a shipping app to automate the fulfillment process.
6. Mobile optimization issues: If your store is not displaying correctly on mobile devices, try using a different theme or adjusting the settings on your current theme to optimize it for mobile. You can also use the Shopify Mobile app to manage your store on the go.
7. Customization issues: If you are having issues customizing your store, try reaching out to the Shopify support team or consulting the Shopify documentation for guidance. You can also try using a third-party app or hiring a Shopify Expert to help with customizations.