今refers to now or the current moment. It is a foundational time word in Japanese. It can be used alone as an adverb or combined with other kanji to form words like 今日(today) or 今月(this month). It emphasizes the immediate present.
That is how Fuguro works. It brings 今 back for review right before you forget it, each time a little later, until it sticks for good. You hear it spoken aloud, and you meet it again in stories you can already read. The first five levels are free.