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oh sorry, I missed that part you asked.
"public nodes" you mean hosted nodes like voltage.cloud?
In any way, if it is a home node (in a machine that you control it) or on a hosted node, it doesn't matter, you need to have the "keys" to that node, otherwise you can't use apps like Juggernaut.
To learn more about LN start here https://lightning.how
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oh! but in any case, about my node question, when any site/software asks "add node", do I need to have my own node like an umbrel node or are there public nodes that can be added? I'm sorry I really need to do a crash course to understand all the lightning lingo, don't understand much.