Especially when making changes in collaborations, it is quite useful to have strikethrough text, so that collaborators can see the deleted text (which can thereafter be deleted). While there are ways to use track changes for LaTeX (see our earlier post here), strikethrough text is probably easier to implement. For a very simple way of striking through text in LaTeX, you can use the soul package and then use \st{Strike through this text}

\usepackage{soul}
...
\st{Strike through this text}


That is it already!

Edit: there seem to be some complications when striking through references (which most of the time does not work for me)