The ETHStaker Validator Workshop Series goes through step-by-step on how to setup and configure a dedicated Ethereum 2.0 validator using the Nimbus Client.
Somer Esat Nimbus Client Guide
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Nimbus Documentation
https://nimbus.team/
Pyrmont Beaconchain
https://pyrmont.beaconcha.in/
Pyrmont Launchpad
https://pyrmont.launchpad.ethereum.org/