Q1. Earlier these days, I saw the usage of "Leader of ...", which is a countable noun without a preceding article. Is that grammatically correct?
What I found in oxford guide to english grammar:
A singular noun on its own • 167
We use a singular noun on its own only in some special patterns.
However, further explanation is not given in that pdf.
Then I found another pdf: esl article usage rules. But I didn't find the usage of "Leader of ..." in it.
So, is the last pdf accurate?
Q2. "a becoming humility"(article before uncountable noun) is OK.
used before some uncountable nouns when you want to limit their meaning in some way, such as when describing them more completely or referring to one example of them:
I only have a limited knowledge of Spanish.
He has a great love of music.
There was a fierceness in her voice.
But in the last pdf esl article usage rules, an article before "thing"(a countable noun) can be omitted:
Rule 37: Use Ø when generalizing about abstract nouns.
ex: Love is beautiful thing.
Is that correct?