In one sentence: "bon/bonne/bons/bonnes" (=good) is the adjective, whereas "bien" (=well) is the adverb.I know that this won't help much but it's a start.
You may want to check out this webpage: https://www.lawlessfrench.com/grammar/bon-vs-bien
Greetings, -- Chris.
Bonjour Dominic !
You might want to have a look at our lesson on mieux vs meilleur, which explains the difference of usage between bien and bon:
Bonne journée !
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