are they countable?

Yes, those words are countable as nouns.

(one) question --> (two or more) questions
(one) answer --> (two or more) answers
(one) rule --> (two or more) rules

AnonymousQuestion, answer, rule are countable?

Can you form your question in an intelligible manner?
If you are asking, can you make a noun plural by adding 's' at the end of the noun?
The general answer is yes. But countable nouns need a numeric value to go with the noun.
For example: I saw a girl in Joh

Thanks, but i still feel confuse...
I learned that abstract words (like advice, information) are noncountable...

Sorry, i'd like to ask how can i make a 'abstract' word's plural
I think question, rule, advice, information are abstract

Question and rule are countable, so they have plurals. In both cases, add -s to make them plural.
Advice and information are both uncountable, so they normally do not have plurals.

Question is countable.

I have only one question.
I have three questions.
Does anyone have any questions?

Rule is countable.
There are three rules here: 1) be polite, 2) don't run 3) ...

Advice is non-count.
I have some advice for you.
I got good advice from my grandmother.

Information is non-count.
I asked my boss for the information abou

Thank you everyone!
Searching dictionary will be the best way

Thanks again