Is 'Happy Birthday' Capitalized?

Since "happy birthday" is not a proper noun, it should not be capitalized in the middle of a sentence.
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An Expert At/In/On

"At" suggests that the expert is very skilled at doing a specific activity. "In/on" is commonly used when someone knows a lot about a particular subject.
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'An Expert in' or 'An Expert on'. Which Is Correct?

Both are correct. However, there is a subtle difference in meaning and usage. "On" suggests that the emphasis is on the specific subject. "In" makes the emphasis on the person who has expertise.
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Is It 'Happy Birthday' or 'Congratulations'?

It's "Happy birthday". When it's someone's birthday, we don't say "congratulations". If we want to say our birthday wishes in English, we just say "happy birthday".
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'Congratulations' Synonyms

Good job!, Warmest congratulations, Bravo!, Well done!, Nicely done, Congrats, Way to go!, You did it!
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Congrats vs. Congratulations

"Congrats" is just an informal and shortened version of the plural noun "congratulations". Both have the same meaning and are commonly used. However, "congratulations" is definitively more formal.
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Is Congratulations a Plural Noun?

"Congratulations" is a plural noun. Some nouns, like "congratulations", are commonly used in the plural.
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