- Overview
    - Reacting to input with state
    - Choosing the state structure
    - sidebarLearn translation

    - Sharing State Between Components
    - Preserving and Resetting State

    - Extracting state logic into a reducer
    - Passing data deeply with context
    - Scaling up with reducer and context

    - Revised mistakes.
    - Changed some words translations.
    - Added translations for code blocks

    - typos mistake in sidebarLearn

    - Keep 'Philosopher’s Path' untranslated