This book mainly introduces freelancing, including its overview, how to enter the field, and methods for finding a large number of clients. It also discusses the considerations for whether to choose freelancing. In the 21st century, the field of freelancing is extensive. There are advantages and disadvantages to becoming a freelancer. To enter freelancing, one can start by not resigning immediately and looking for relevant jobs online. After determining the field, find clients through forums and databases. In the early stage, accept low-paying jobs to accumulate experience and clients and create a portfolio. To find a large number of clients, one can use online resources to promote services on forums and freelancing websites and pay attention to websites and platforms in specific fields. When choosing freelancing, one needs to consider economic conditions, stress tolerance, communication ability, etc. One can start by trying with low-paying clients and consider health insurance issues.