esto (neutral)/ este (male)/ esta (female)
Esto es un escritorio / esto es una mesa (This is the objecto you're talking about it is followed by a verb)
Esta mesa es blanca (it is a demostrative adjetive for femele nouns)
Este libro estα sobre la mesa (it is a demostrative adjetive for male nouns)
Please correct me if I'm wrong.
Hope it helps!
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