User interviews are great for getting to know your customers, generating ideas, and testing new ones.
Qualitative usability testing can help you get feedback on a specific aspect of your product or prototype.
Product/market fit interviews help teams learn whether or not their product or prototype fills an actual user need.
Diary studies can help you learn about how your users feel about something over time, how they complete tasks, and can be a good remote alternative to field studies or ethnography.
Continuous user interviews help you get (and keep!) a finger on the pulse of your customers.
