This is the 6284th most frequent Japanese word.
コト
"コト" means "thing," "matter," or "event" in a non-physical, abstract sense.
Here, 'コト' represents 'a matter' or 'thing' referring to something abstract or conceptual.
それは大切なコトです。
That is an important matter.
In this sentence, 'こと' is used grammatically to nominalize the verb '話す' (to speak), turning it into a noun phrase meaning 'speaking Japanese'.
日本語を話すことができます。
I can speak Japanese.
'こと' in this context refers to 'something' in an abstract sense, implying finding enjoyable activities or experiences.