QuerySelector for more than one ID [closed]

I am currently learning to code JS and like probably many other people before, I’m writing a ToDo List.

But at this point I’ve got a problem.

let DivNone = document.querySelector('#div2');
let BtnNone = document.querySelector('#btn3');

How can I put these two lines in one?

I already tried to use:

document.querySelectorAll('#div2, #btn3')

But somehow it doesn’t work…