Actual methods, some quite ingenious and worthy of HN discussion, are documented here:

https://nypost.com/2020/08/29/political-insider-explains-vot...

Plugging the holes, even if you don't believe they are being exploited, is essential to restoring bipartisan trust in our elections.

Lax voter ID laws and making it really easy to steal votes through the mail is a good start.

I find it odd that seemingly intelligent people ignore these glaring security holes to further their own political agenda.