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.
The sun radical at the base indexes the character. Reading the picture: warmth from the sun below, new growth sprouting above — the season when life returns. The 日 anchor is the dictionary handle for this clearly seasonal compound.
The upper five strokes are a fused residue from the original 春, which had 草 (grass) plus 屯 (sprout pushing through soil) across the top. The modern silhouette has compressed those into a non-decomposable bundle suggesting young growth pushing upward.
