If it's offline, first prepare a general electronic resume (you can also personalize the resume that meets the company's requirements according to the company you choose), then print it out (not too much, two sheets of paper are enough, usually one sheet is enough) and deliver it to the job fair on site.
Whether online or offline, all you need to do is wait after your resume is delivered. Pay special attention to one thing, whether online or offline, don't expect too much. The best way is to invest in more companies and expand the chances of being recruited, so as not to miss more opportunities while waiting. Finally, I wish you an early employment.