There are a lot of resources about how to use methods in research. You will find a selection of books on the shelf Kursbok Metodik at the LUX Library.
SAGE Research Methods Online (SRMO) is a database with over 1400 qualitative, quantitative, and mixed methods topics and terms. You can search in over 500 books Dictionaries, Encyclopedias and Handbooks. Use "Methods Map" to browse resources in a specific topic.