Palestine

Maybe go back to the Nakba, but I'm not sure of a good resource on it offhand. I think it fast becomes pretty evident if you skip past the both sides narrative and go to how the zionists acted from the start, how murderously violent. I think before I understood it, that part was left out in what I'd heard about the "conflict." I would tend to hear about it as something that had been going on for a long time between "both sides" rather than as something that one side started (the zionists) and that required violence displacement in order to begin and further its (the zionist) project. That there was never a real interest in peace or coexistence from the zionists and never has been; quite the opposite.

When you strip away the veneer of it being portrayed as a longstanding both sides dispute, it's naked colonialism and empire.

But anyway yeah, anything and everything you can show them, that helps demonstrate the brutality of zionists may help. Just remember, the more you ground it in fundamentals about this kind of stuff (like colonization) the harder it is for counter narratives to sway them in another direction. Understanding, for example, that israel pathologically lies about what it does and the western empire and its tendrils pathologically lies for them as well, so most things they say on the subject are suspect at best. People need to know that it's not an isolated incident of settler aggression, but an arm of something much larger and more destructive in various forms across hundreds of years, through the British empire, through French colonialism, through the US. Which could be a lot to try to explain to someone right away, but I think is important for being as grounded as possible and being able to understand what's happening with Palestine in the broader anti-colonial, anti-imperialist struggle. Partly because even if the zionist project were to fall apart tomorrow, that would not mean imperialism and colonialism as a whole are now over and a thing of the past.