Welcome to Android Central! I moved this to the Android TV forum for more specific traffic.
Start with this article:
https://www.androidcentral.com/android-tv. Android TV is designed specifically for a TV interface and for TV viewing, so it certainly won't be as versatile as the regular Android interface on a phone or tablet. Remember also that TVs won't have the processing horsepower or the same amount of dedicated storage that a phone or tablet has, so the more pared down it is, the better.
What kind of TV can you watch on the phone that you can't on your Android TV? It might be some kind of service that's a bit shady, that you're able to find workarounds on a phone, but won't on Android TV due to its limitations.
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