tl;dr

This is an alternative way to understand tl;dr

So usually it's a response to a long-winded written explanation that someone posts online. But it can also be used as a brief summary of something at the top of a post for readers who don't have time to go through the whole thing

For example: My trip to Europe

tl;dr - I went to Europe, I ate cheese, danced with beautiful woman, hooked up with a man and had a unexpected boat trip.

Full post
On 21 January I got the itch to travel, so I spontaneously booked a trip to Europe... insert rest of post

Friend who got a job interview: I’m very excited. Also cautious.
Me: whats the tl;dr