some states have a reciprocity agreement whereby you only file in your resident state. see the link. if not, your w-2 is probably wrong in that it should show the state you worked in. taalk to your employer. technically, in most cases, you need to file in two states. your work state (but only if it has an income tax)
Alaska, Florida, Nevada, South Dakota, Texas, Washington, and Wyoming don't have income tax.
In addition, New Hampshire and Tennessee don't tax wages or earnings.
you also file in your resident state and get a credit for taxes paid to work state,
https://www.thebalance.com/state-with-reciprocal-agreements-3193329
