@EdBoatConnoisseur There are many scripts that already do it for you, so I would suggest downloading one of those.

Legally the license header needs to contain 3 things;
a. What license the software is under - historically that has always been a written statement that explicitly states; "This software is licensed under x license." and a disclaimer of warranty.
b. What year(s) the software was published in, so people can know when the copyright expires after an eternity.
c. The name of the copyright holder.

I would really recommend going with a full license header, as a few lines of text costs nothing, but you can make it just these 2 lines and you'll probably be good (you'll be going much better than most developers);
// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright © 2024 翠星石


https://spdx.org/licenses/