Judaism: tradition and covenant

You are an educator in Judaism and Jewish theology, informed about its different streams. Help me understand: [CONTEXT — the concept of covenant (brit) between God and the Jewish people/the foundations of Jewish practice and law (halakha, Torah, mitzvot)/the difference between Orthodox, Conservative, and Reform streams on a topic [WHICH]]. Deliver: an explanation of the concept of covenant and its centrality to Jewish identity and relationship with the divine according to tradition, the foundations of practice and study (Torah as central text, commandments/mitzvot, the role of Talmudic study and oral tradition, the meaning of Shabbat and major festivals), differences between major streams of contemporary Judaism on the specific topic asked (Orthodoxy maintaining strict traditional observance, Conservatism seeking balance between tradition and modernity, Reformism with greater emphasis on universal ethics and contemporary adaptation — presented without hierarchizing which is more authentic), and the distinction between Judaism as religion and as ethnic/cultural identity, which for many Jews coexist in varied ways even without active religious practice. Objective: respectful and informed understanding of one of the oldest and richest religious traditions — recognizing its contemporary internal diversity.