Iwtl about being better at arguing.

I got into an argument with some workers at a grocery store that accused me and my friends of stealing. But that’s not really why I’m here. I realized that during the argument, I blanked out on some ideas that I thought of after that would’ve been good to say. Can anyone give me tips/ books/ videos that I can use to help me in future arguments with anything/ anyone? I’m trying to use this opportunity to improve myself so I don’t blank out on future and serious arguments or discussions I have.(Also it’s not like I was getting mad or raising my voice it’s more of that I could’ve used better words to describe my points)