The word 辅导 is formed by combining two characters, each contributing a core action to create a unified concept. 辅 (fǔ) originally depicted the protective side-rails on a chariot, extending metaphorically to mean "to assist" or "to supplement". 导 (dǎo) means "to guide", "to lead", or "to instruct". Together, they form a compound where the guiding instruction (导) is inherently supportive and supplementary (辅), picturing the holistic act of providing tutorial guidance that both leads and assists a learner.