I'm making an Android app and I'm stuck with errors and how to solve it

https://www.udemy.com/share/101xtQB0ASdFdaRHg=/ I'm doing the above course on Udemy and record where I'm stuck with errors and how to solve it.

■ The latest version of Android Studio and the version used in the video are different and I got stuck because the video did not follow.

→ Download the version used in the video from this page and solve it. https://developer.android.com/studio/archive.html#android-studio-2-3-3

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