Some of my best (by content, not votes) answers:

React

SearchInput Component: Update optimization

Redux

Step by step explanation of the React lifecycle after action dispatches

JWT authentication and token validation strategies

Data fetching strategy (1): Detailed explanation on the didInvalidate, isFetching concepts

Data fetching strategy (2): Detailed explanation on the didInvalidate, isFetching & cache invalidation concepts

Actions & reducers: Structure to fetch all items & single item

Syntax

Explanation of the async / await vs then syntax

Step by step explanation of the spread syntax

Reducer + spread syntax