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Hablo español bien.
I speak Spanish well.
In good health or condition
¿Cómo estás? — Estoy bien, gracias.
How are you? — I'm fine, thanks.
Correctly or satisfactorily
Lo hiciste muy bien.
You did it very well.
Very much; a lot
Tengo bien hambre.
I'm very hungry.
Used colloquially to intensify adjectives or verbs.
Property or possession
Los bienes de la familia.
The family's property.
Use 'bien' (adverb) to describe how something is done (e.g., 'canta bien'). Use 'bueno' (adjective) to describe a noun (e.g., 'un día bueno').
As an adverb, 'bien' usually follows the verb it modifies (e.g., 'come bien'). As a noun, it precedes the noun (e.g., 'los bienes raíces').
From Latin bene (well), via Old Spanish bien.
As an adverb, 'bien' modifies verbs/adjectives (e.g., 'hablar bien'). As a noun, it refers to goods/property (plural 'bienes'). In some regions, 'bien' can mean 'very' (e.g., 'bien caro').