春 is used in: 春天 (spring), 春节 (Spring Festival/Chinese New Year — the most important holiday), 春卷 (spring roll), 青春 (youth). 春联 (Spring Festival couplets) are red banners with lucky phrases.
culture
春节 (Chinese New Year) triggers the world's largest annual human migration — 春运 (Spring Festival travel rush) — with billions of trips made.
