Thanks Michelle, It was  nice to know the difference between redux and Redux Toolkit. I had experience  working with Redux but just got know that redux toolkit makes a developer life more easier.

I get an error while I am trying to submit or check the answers  

Week 4  is completed.  

Week 3 Submission is here  

Week 2 Submission is here. I was in a impression as stated in the blog that for week one it self I need to complete all four. But good to know tht for each week we have  to complete one exercise.