I lost my w2 for 2023 and didn’t file. I am asked for my ago from 2023 returns, would I answer $0 since it wasn’t completed?

And....if you worked in 2023 and had a W-2, you could still file a 2023 tax return to seek a refund of federal and/or state tax withheld  in boxes 2 or 17 if you obtain a copy of the W-2 from the employer.  You could ask the employer for another copy of the W-2.  If you are getting a refund, there is no penalty for filing late.

A 2023 tax return cannot be e-filed.   It has to be filed by mail.   You could get the paper forms or use the desktop download software to prepare the return to mail in.

2023

Form 1040 (2023) PDF

Related:

Instructions for Form 1040 (2023) PDF
Form 1040 Schedule 1 (2023) PDF
Form 1040 Schedule 2 (2023) PDF
Form 1040 Schedule 3 (2023) PDF
Publication 17 (2023) PDF

Online preparation and e-filing for 2021, 2022, and  2023 is permanently closed.

Note:  The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac.  It cannot be used on a mobile device.

To file a return for a prior tax year

 If you need to prepare a return for 2021, 2022, or 2023  you can purchase and download desktop software to do it, then print, sign,  and mail the return(s)

https://turbotax.intuit.com/personal-taxes/past-years-products/

You may also want to explore purchasing the software from various retailers such as Amazon, Costco, Best Buy, Walmart, Sam’s, etc.

Remember to prepare your state return as well—if you live in a state that has a state income tax.