My husband is going to study in Austria (I am married), and I want to apply for a companion visa. Please help me with experience and guide me on what to do! Thanks!

Go to the website of the Austrian Embassy in China to see the requirements. There are very detailed instructions on it. If your husband is working, such as a postdoctoral fellow, you can apply for a visa together. If you are a student, you can apply for a family visit visa, but it is slower. You have to wait until he gets there and after he settles in, you can apply with relevant certificates and proof of funds. Generally speaking, as long as the conditions are met, the visa is unlikely to be refused.