Should I install all Android SDK tools?

No, You don’t need to install everything . Install the “SDK Platform” for the Android versions you’ve set as minimum, target, and in-between the minimum & target. The Android SDK Extras are usually not required; but it is useful to be aware of them since they may be required depending on your use case.6 Mar 2015

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What is Flutter app used for?

Flutter is Google’s portable UI toolkit for crafting beautiful, natively compiled applications for mobile, web, and desktop from a single codebase . Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.

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