If you’re looking to learn how to do customer interviews to improve your product or service, here are some helpful guides from one of my favorite resources.
This short video explains “the difference between the 3 main types of user interviews, and at what stages of a UX design process it makes the most sense to use each”. To learn tips and best practices on how to write an effective interview guide and how to conduct user interviews take a look at Writing an Effective Guide for a UX Interview and User Interviews: How, When, and Why to Conduct Them. Also, take a look at Why User Interviews Fail to ensure you do them well.
If you have questions or need help with customer interviews, feel free to reach out.