Felt very dejected in the morning. Then recovered. Focussed on the task of the day.
Had a very good day studying React. Getting to write code and think once again.
Got stuck on a concept with useState. Had to study and learn more.
Then I could not understand how John had implemented the slider. I used what I could learn and did my own version, which makes sense to me. It has 95% of the functionality.
The key thing is to study React everyday till you become very comfortable with it.