You learned something in class that stuck: that almost everything you do online leaves a trail — your posts, your comments, your photos, the things you search, the accounts you follow. Bits of it can last for years. One day, people you haven't even met — a future school, a future team, a future you — might be able to see pieces of who you are right now. It's a strange thought. The version of you online isn't just for today's friends. It's a kind of record, being written a little at a time, mostly without you thinking about it. You're not sure whether that should change anything about what you post. You're leaving footprints, and you can't always see where they lead.