• Home–school partnerships and parental involvement emerge as a core mechanism shaping early literacy, curricula priorities, and classroom expectations across settings, with parental views, parent–teacher conferences, and culturally informed involvement guiding practice [1], [5], [10], [14], [19].

• Teacher professional development and reflective practice are repeatedly identified as central to improving early childhood teaching, highlighting inservice education, long-run teacher maturation, and learning from experience [20], [18], [17], [11], [15].

• Policy analyses and debates shape access, funding priorities, and perceived long-term effects of preschool, linking systemic decisions to equity and program efficacy across nations [7], [4], [8], [16], [6], [12].

• Curriculum design and instructional methods are scrutinized through empirical testing of teaching strategies and procedural interventions, with emphasis on which skills to emphasize and how to teach them effectively [5], [9], [13], [12].