If you are highly focused and devoted to learning flutter, then, it would hardly take you more than a week . But If you learn it on daily basis, along with experimenting different things on the way of learning, then, it might take you around 1 month and believe me, this method is much better for learning.
Read moreCan I learn Flutter without Dart?
It is very easy to kickstart your journey with Flutter Framework(UI Kit). Flutter framework uses Dart Programming language. So first you need to learn Dart . You don’t need to thoroughly go with any specific course for dart.
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