Excuse me, can I send my resume directly to HR at the job fair? Or is there another process? Never been there. I'm working on it.

Generally speaking, HR will judge whether it is necessary to accept your resume after simply asking some questions. If you accept it, it means that you may be further investigated and judged until you sign the contract.

There are also some HR units that just collect resumes and then review, analyze and judge after returning. Those who meet the requirements will be asked to interview until signing the contract.