What's the correct form of the word "esoterics", it being a subject? [duplicate]

grammatical-number

Solution 1:

The word esoterics does not appear in Lexico (Oxford) online dictionary.

Esoteric is an adjective so it does not become a plural.

Esoterica is a mass noun, and doesn't really describe the oddities of language.

Your choice does not really fit, so I suggest your blank could be

I have yet to master its peculiarities.

Or more simply,

I have yet to master its finer points.

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