I personally use a free online text book: Bhattacherjee, A. 2012. Social Science Research: Principles, Methods, and Practices. USF Tampa Bay: Florida. http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1002&context=oa_textbooks
There are several books that provide good explanations of qualitative research. It is difficult to say that this is the best book like that. However, the following book may be useful for your requirement,
Qualitative Research DesignAn Interactive Approach
You could go for Creswell and Poth’s (2018) book, Qualitative Inquiry and Research Design: Choosing Among Five Approaches. Its cover is attached. Here is the full citation.
Creswell, J. W., & Poth, C. N. (2018). Qualitative inquiry & research design: Choosing among five approaches (4th ed.). SAGE. https://us.sagepub.com/en-us/nam/qualitative-inquiry-and-research-design/book246896