The introduction should briefly place the study in a broad context and highlight why it is important. It should define the purpose of the work and its significance. The current state of the research field should be reviewed carefully and key publications cited. Please highlight controversial and diverging hypotheses when necessary. Finally, briefly mention the main aim of the work and highlight the principal conclusions. As far as possible, please keep the introduction comprehensible to scientists outside your particular field of research. Citing a journal paper \citep{ref-journal}. Now citing a book reference \citep{ref-book1,ref-book2} or other reference types \citep{ref-unpublish,ref-url}. Please use the command \citep{ref-proceeding,ref-thesis} for the following MDPI journals, which use author--date citation: Administrative Sciences, AI in Education, Arts, Behavioral Sciences, Businesses, Econometrics, Economies, Education Sciences, European Journal of Investigation in Health, Psychology and Education, Family Sciences, Future Collections, Libraries, Archives, and Museums, Games, Genealogy, Histories, Humanities, Humans, International Journal of Cognitive Sciences, International Journal of Financial Studies, Investment, Journal of Intelligence, Journalism and Media, Journal of Risk and Financial Management, Journal of Strategic and Applied Marketing, Languages, Laws, Literature, Operations Management, Peace Studies, Project Management Horizons, Psychology International, Publications, Religions, Risks, Social Sciences, Tourism and Hospitality, Youth.