some of command and codes thats may come handy in future

android-cheat-sheet

*run gradle with more info
Go to your Android project directory to execute the gradle command below:(in linux) windows = gradlew.bat

    ./gradlew assembleDebug --info

Note:If you have permission problems while executing the above command,you can use this to deal with it:

chmod +x gradlew
*gradle version infos
./gradlew --version

*clean project
./gradlew clean  

*build project
./gradlew build

*build for debug package
./gradlew assembleDebug or ./gradlew aD

*build for release package
./gradlew assembleRelease or ./gradlew aR

*build for release package and install
./gradlew installRelease or ./gradlew iR Release

*build for debug package and install
./gradlew installDebug or ./gradlew iD Debug

*uninstall release package
./gradlew uninstallRelease or ./gradlew uR

*uninstall debug package
./gradlew uninstallDebug or ./gradlew uD 

*all the above command + "--info" or "--debug" or "--scan" or "--stacktrace" can get more detail information

*rerun tasks
--rerun-tasks

*run test
./gradlew test 

*run instrumental tests
./gradlew connectedAndroidTest

>>more info 
https://developer.android.com/studio/test/command-line
https://docs.gradle.org/current/userguide/command_line_interface.html