Generate key Android app


I have doubts as to generate keys for an Android app, according to documentation,

I use these codes, but I understand nothing. Someone could guide me. I work in windows

Thank you

$ keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000

$ jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore HelloWorld-release-unsigned.apk alias_name

$ zipalign -v 4 HelloWorld-release-unsigned.apk HelloWorld.apk