If you have information at your fingertips, you can get it and use it very easily.

He has all the latest statistics at his fingertips. 他手边有所有最新的数据。

to be a perfect or typical example of something

Mark, a professional to his fingertips, insisted that we follow the correct procedures. 马克是个地地道道的专业人士，他坚持让我们遵照正确的程序。