Every Android project I've ever opened starts the same way. Right at the top of build.gradle , before any dependencies, before any SDK versions, before anything useful — there's this:

plugins { id ( "com.android.application" ) kotlin ( "android" ) }

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I copy-pasted those two lines into every project I created for months. I never touched them. I didn't know what they did. I was honestly scared that if I looked at them too hard something would break.

And then one day I created a new project and only saw one of them:

plugins { id ( "com.android.application" ) }

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The kotlin("android") line was gone. Just... missing. I panicked. Googled it. Added it back. The build failed. Removed it.…