Hi, everybody! I cannot understand WHY we say, for example:

What a good advice!

But on the other hand we say:

What good advice you have given me! (without "a") (Here, why we do not say?: What a good advice you have given me!)

And thank you in advance!

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What a good advice! This refers to a/one specific piece of advice.

What good advice you have given me! This refers to general advice provided, nothing specific.
Hello Eladio-- what a nice surprise! Hace mucho tiempo...(since I studied Spanish).

Actually, I don't think we say What a good advice!. We say What good advice! or What a good piece of advice! Advice is uncountable except in the very specialized case of a commercial document (e.g. a shipping advice).
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Thank you Marius, but I do not understand very well. Does it means that I can say:

What good adive! and What a good advice you have given me! ??

We say: What a lovely day!; What a pretty woman!; What a beautiful forum is this! and these sentences are all correct (I believe). Would you be more explicit, please!

See the reply from MM on advice being uncountable. He's right.
After reading Marius's post, I checked again. It is still not generally countable, but there is another case where a plural form is used: "information or notice given -- usually used in plural."
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As you can see here, it's marked U (Uncountable):

noun [ U ]

This is one of the few dictionaries which indicate that.
Wow!, Mister Micawber, yes I suppose it's nice to see me again in EF, but it's nicer that you pay attention to my fool questions, thank you!

Now, I think I've got this point! So, could we establish a "rule" for countable and uncountable things, something like this:

What a beautiful girl! (Girls are countable, really?)

What warm and nice water in this beach! (water is uncountable)

Am I ok?

Look in the dictionary I've listed in the above, for checking on U(uncountable) or C(Countable) issues.
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