I worked for less than 2 weeks in Walmart . Most of those 2 weeks were in Dec/2019,and some were in Jan/2020. I moved out that state after that, and I don’t have w2 form for that job. What shou

Contact Wal-Mart HR and get a copy.   If you worked one day in 2020, they have sent a W-2 to the IRS.  If you file without it, you are risking holding up your tax return for months.  Your situation is very common - Wal-Mart can probably provide you a way to retrieve the document online.   The IRS does not start accepting returns until the 12th so there is no reason to file early without that W-2.  It will cause you more grief and delays in the long-run.