You don’t need a package at all. I just define a new command \xxx{stuff} that changes the colour to red. It’s a one-liner. Copy and paste that into any new document. Changing the colour without a custom command is equally trivial, but this allows you to search for “xxx” to find anything you might’ve missed.
Considering how widespread of a situation it is, I am surprised I haven’t found yet a good LaTeX package that handles temporary sections
You don’t need a package at all. I just define a new command
\xxx{stuff}that changes the colour to red. It’s a one-liner. Copy and paste that into any new document. Changing the colour without a custom command is equally trivial, but this allows you to search for “xxx” to find anything you might’ve missed.why not add notes as marginalia?