As long as you have a doctorate, you can apply for the National Natural Science Foundation, general funds and youth funds. However, it is generally difficult to apply for a youth fund first.

You need to know some details of the postdoctoral fund application in advance. After all, it is often the details that determine success or failure. For example, you can mention your on-the-job postdoctoral experience in the body of the application, but it is not recommended to mention it in your resume, because it will omit the part of the unit commitment letter.