最【zuì】

最 before an adjective makes it a superlative. There is no ending to change and no irregular forms.

The group goes in front

Whatever the superlative is measured against comes before 最, not after.

的 when a noun follows

最好的朋友, 最贵的手机. Drop the noun and 的 stays: 最贵的.

最 with a verb

Verbs of liking and wanting take it directly, and 最喜欢的 plus a noun is how "favourite" is said.

最好 as advice

In front of a verb, 最好 stops being a superlative and means "you'd better".

No 很

最 and 很 do not stack. zuì最hěn很hǎo好 is wrong.