Answer:
Nobody really knows how many genders there are.
Explanation:
It widely depends whether you're referring to actual genders or gender identity types. Even then, though, there is not a definite or limited amount of either. For more clarification about the differences...
Gender identity types include: transgender, nonbinary, agender, demigender, etc.
These are not genders because they don't specify what you identify as, they are simply stating that you do not identify with your sex at birth. Don't call these genders, because that would be putting agender and nonbinary people into a binary.
Actual genders include: two-spirit, pangender, polygender, etc.
These are GENDERS rather than gender identity types because they somewhat specify what you identify as.
To say that there are only two genders is incorrect, as gender is a social construct. That does not mean it's useless, it just means that it wasn't constructed correctly because nobody knows for a fact how many genders and gender identity types there are and we probably never will because it's based on one's individual feelings.
