For those more comfortable with using plugins, rather than editing theme files directly, this section is for you.
One benefit of not editing theme files directly is it reduces the chance of missing out on updates/changes to parent theme files, like header.php.
Note: Please remember to only have GTM set up for tracking using only one method.
For example, if you’re moving over to the plugin method, be sure to address any theme files you edited previously.
So, in our case, we no longer need to have a copy of header.php in our Child Theme, so we simply remove it.
Pro Tip: We recommend keeping a changelog of everything you do on your website, in terms of adding/editing/removing files, what solutions were added, and why.