Qualitative research provides more in-depth and valuable information compared to quantitative research, which collects more vague findings. Primary research involves directly interviewing, surveying, or questioning people, and can be qualitative or quantitative. It has advantages like interviews providing specific answers or observation allowing researchers to watch people's daily activities without much interaction. Secondary research uses previous research findings from third parties through methods like questionnaires, surveys, books, or newspapers to support conclusions without conducting original research.