do i need a jar plugin for sponge
Yes. You need compiled jars of your desired plugins.
Please remember
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The SpongeDocs are veritable treasure trove of information. AFAIR every single question you have posted related to Sponge has already been answered on the docs 
Here’s the page you’re looking for:
https://docs.spongepowered.org/en/server/management/plugins.html?highlight=plugins#installation
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Lemonous thx 