Principles: Fundamental beliefs guiding teaching practices (e.g., language should be meaningful).
Strategies: Plans or general methods for achieving specific educational goals (e.g., promoting interaction).
Techniques: Specific activities teachers use in class (e.g., drills, role-plays).
Methods: Systematic ways of teaching based on selected principles (e.g., Audiolingual Method).
Approaches: Broad theoretical frameworks providing underlying philosophy for methods (e.g., Communicative Language Teaching).