Use the methods in the Schema.FieldSetMember class to get details about fields contained within a field set, such as the field label, type, a dynamic SOQL-ready field path, and so on.

Check the below link for more information

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_class_Schema_FieldSetMember.htm

Cheers!!!