I think the 2020 court cases, all of which Trump lost, show how little fraud occurs. There are also many articles of research at this point.

https://www.npr.org/2024/10/11/nx-s1-5147732/voter-fraud-exp...

https://www.brennancenter.org/our-work/research-reports/reso...

It's another GOP boogie man used to suppress the vote. Personally, I'm a fan of legally mandating everyone vote or pay a fine like in Australia.