How to modify the signature file of android studio

The default Android Studio signature generates apk files or unsigned apk files, and click "Build->; Build APK "generates two kinds of files, default signature and default unsigned.". Click "build->;" General signature apk "specifies a custom signature file and generates a release version of the signature file. If there is no signature file, please create one first.

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Q: Is it four or five years from 65438 to 0996 for the undergraduate major of traditional Chinese medicine in Hebei Medical University?

Which pdf virtual printer do you want to add a digital signature to?

Poetry is useless, why "recite the whole text"?

The families who graduated from junior high school are all farmers. How to write the autobiography of joining the party?

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Does the electronic signature contract have legal effect?

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The plot of Conan's children eating blue vinegar, specifically, Ke's fans are welcome, especially fans.