前言：
Every time you do anything on the internet you leave a trail behind you, in the same way you leave a footprint when you walk on sand or mud. Do you know how to take care of your digital footprint? Here are some tips.
每次你在網路上做任何事情時，都會在身後留下一條痕跡，就像走在沙子或泥濘上時留下腳印一樣。你知道如何保護你的數位足跡嗎？這裡有一些提示。