WHOLE CHARACTER
广
wide; broad; numerous; vast; to spread; to extend
广 is the wide-open shelter shape: a square (广场), ads (广告), wide-ranging (广泛). Its older readings ān and yǎn are dictionary history.
Taught as one written unit: the shelter-shape 广. Modern guǎng means wide — it is the simplification of 廣, whose sound side 黄 is not written here. Older dictionary uses (ān 'a hut', yǎn 'a shelter against a cliff') are kept as history, not everyday words.