Do you require any key for development?
If you are planning to release any application into the market, then it is mandatory to sign your application with private key.
But at the initial stages, you can use debug key which is located in c:\users\<username>\.android folder.
But remember you can't release an application which is signed with your debug key. You have to sign with a private key obtained with keytool
command. keytool is a .bat file available in java\jdk\bin folder.
You can use keytool to create your own private key with password.
Note: Important to remember that don't ever forget your key and password, else it would become impossible to upgrade your application.
To upgrade your application you have to sign with same application.
More about how to create private key and how to use keytool, please refer to below official android link.
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