Enough comes after adjectives and adverbs:

• It wasn't good enough. (Good is an adjective)
• I didn't do well enough. (Well in an adverb)

Enough comes before nouns:

• I didn't have enough money. (Money is a noun)

We use enough of before the and this, that, these & those:

• Are there enough of the copies I made for everybody?
• I've had enough of this rubbish.

We also use enough of before object personal pronouns:

• Were enough of them there last night?

NB Sometimes people put enough after a noun, but this is for effect as it sounds a bit archaic and formal.

Enough can be used before an infinitive:

• They don't have enough to eat.