2019
TraversyMedia - Vuex Crash Course | State Management
    https://www.youtube.com/watch?v=5lVQgZzLMHc
2018
VueMastery - Vuex - Intro Tutorial
    https://medium.com/vue-mastery/vuex-explained-visually-f17c8c76d6c4
    https://www.youtube.com/watch?v=_2_C9j-8CtM