There are four types of market research methods that each types has its own purposes. As a freelancer providing market research services, you need to understand what those four types are and how they can benefit your clients for the good of your career:

1. Exploratory research: Gather information and insights to help clients better understand their target audience, competitors, and industry trends, by collecting qualitative data through focus groups, surveys, and other methods.

1. Descriptive research: Provide clients with a better understanding of their target audience's behaviors and preferences, by collecting quantitative data through surveys, observation, and other methods.

1. Causal research: Establish a cause-and-effect relationship between different variables by conducting experiments and analyzing data to determine the impact of certain factors on consumer behavior.

1. Predictive research: Predict future trends and behaviors based on historical data and statistical analysis by using predictive modeling and other techniques to forecast future sales, demand, and other important metrics.

Being a freelance market research service provider, you can offer a range of market research services, including data collection, analysis, and reporting to your customers. And understanding these different types of market research and their purposes will help you better tailor your services to your client's needs and help them make informed business decisions.