1. If you can fill in the expected salary horizontally, HR will be more interested in you. Expected salary is only one of the conditions for you to find a new job, not a fixed condition. If you have a clear goal when looking for a new job, writing salary can help you filter out some companies that can't meet the requirements, so as not to make a trip in vain.

2. If you must specify the salary, I suggest that you first know the salary range of your target function in the industry when you fill it out. Understand the salary range of a certain field, an industry and a function. In this way, your salary requirements can also be regarded as "well-founded", rather than rushing things and losing opportunities.

3. After knowing the approximate salary of your target function in the industry, give an approximate range combined with your previous salary. Don't frame it too small, the higher it is, the lower it is, so you can talk freely about salary.

4. If the employer does not explicitly ask the job seeker to state the expected salary in the recruitment notice, and you really don't know the salary level inside and outside the industry, then I suggest you choose not to write conservatively or write "negotiable".