I'm just wondering about "de" or 的...

That makes it posessive; you can't really put it after an adjective.

Also, in Chinese, adjectives being equated with nouns (e.g. "he is good") are referred to themselves as "stative verbs." So, technically they just say "He good" and use "good" as both adjective and verb.

Instead of saying then: 他是很好 ("ta1 shi4 hen3 hao3" "He is very good")

One would say: 他很好 ("ta1 hen3 hao3")

(the numbers are for the tones.)