The merge is extremely confusing for me

Hi fellow reddit user,

Recently, i've been trying to understand and learn about crypto, and now I have some decent knowledge. Even so, I find the Ethereum merge extremely confusing, and here are my questions:

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– Is BETH a testnet right now ?

– Will the new ethereum blockchain work on ETH or BETH ?

– When the merge happens, and you decide to convert to BETH, to you keep your old ETH ?

– Will old ETH be worthless ?

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Thank you to anyone that will respond to the questions