In some states, you need to have an ID in order to vote. In other states, you don’t. Different states accept different things as ID (eg: In some states it can be things like a utility bill).
Vote Riders has a complete state-by-state list of everything you need to know about Voter ID: https://www.voteriders.org/get-voter-id/voter-id-info-cards/
Vote Riders also has a Voter ID hotline you can call if you need help understanding voter ID in your state, or if you need help getting an ID: 844-338-8743.
Voter Riders also has a contact form you can use to ask for help.