a secret - uncountable?

[Lenka]

Word "secret" is uncountable, isn't it?

So how can you say sentences such as: "Keep it a secret" or "It's a secret", while "secret" is uncountable?
Or is it countable?

Advice is uncountabe too, isn't it? Can we say "she gave me an advice"? Or just "some piece of advice"?

[Casiopea]

"secret" is countable. You can have more than one, right?

EX: It is a secret. ("It" is singular)
EX: Keep it a secret. ("it" is singular)
EX: I've got a few secrets, whereas my friends has many secrets. (plural)

"advice" requires a quantifier; e.g., piece of.

EX: Could you give me some advice?

[Lenka]

oh... I should know that "secret" is countable....

Thanks, Casiopea!