The word 最好 is formed by combining the character 最, which means "most", with the character 好, which means "good"; the adverb 最 directly modifies the adjective 好 to express the superlative meaning of "best".
Example Sentences
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你最好多吃蔬菜。
Nǐ zuì hǎo duō chī shūcài.
You had better eat more vegetables.
旅行前最好检查一下证件。
Lǚxíng qián zuì hǎo jiǎnchá yíxià zhèngjiàn.
You'd better check your documents before traveling.