What does "at the tips of their fingers" mean? Is it an idiom?

Native speaker’s answer
Rebecca
"At the tip of one's fingers" or "at one's fingertips" means that something is available and readily accessible. It's usually related to information! It's not quite an idiom, but rather a phrase. Ex: With access to the internet, billions of people have information at the tips of their fingers. Ex: The opportunity was at your fingertips, but you didn't take it.