Which state management is easy and best to learn?

They are different tools. You should learn them all so you can choose the best one in the right situation. Provider, Bloc and Getx are all worth learning. Iam currently using provider and found it very easy. Redux is also very easy and good for small and big project. 

Mobx with provider. coz., It give better control on state.

There is no best one. You should learn them all so you can choose the best one in the right situation. These are different tools. Bloc, Provider, and Getx are all worth learning.

Use expanded and u can specify flex value 

	Row(
		children:[
		Expanded(
		flex:1,
		child:Container(
		child:Row()
		)
		),
		Expanded(
		flex:3,
		child:Container(
		child:Row()
		)
		)
	]).

Use expanded and u can specify flex value 

	Row(
		children:[
		Expanded(
		flex:1,
		child:Container(
		child:Row()
		)
		),
		Expanded(
		flex:3,
		child:Container(
		child:Row()
		)
		)
	]).