RSA encryption keys

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whats the easiest way to generate AES 256bit encryption keys on windows 10 pro and to be able to manage them?

I'm not sure about generating encryption keys, but I know for Windows Vista and later, you can use Bitlocker to encrypt your entire drive. Bitlocker uses the AES cipher, though I think you can choose a different cipher if you want to use RSA. You can use this in conjunction with the older EFS feature, which provides on-the-fly encryption for individual files, if there are any files that are especially sensitive and you want to make sure no one can access them, even if they crack the Bitlocker key through a cold boot attack or something. I believe the encryption key is automatically generated from your password, because that's how FileVault does it.

Easiest?
https://asecuritysite.com/encryption/keygen

Most secure?
There are conferences on the topic that end up in threats of duels with pistols (just kidding).

I tend to have GPG everywhere so I would just use Gpg4win:
gpg --gen-key --cipher-algo AES256

Kleopatra works adequately for key management.