Vienna Gambit

the Vienna Gambit is a strong gambit to play if you're below 1000 elo. This gambit gives you good attacking chance and a strong center space such as this position. If they are not prepared for the Vienna Gambit, you will have a position that looks like that which has open space, great developing, and central space if you were black in this position, you will in big trouble!! 

As you can see, Vienna Gambit starts like this E4, E5, Nc3, Nf6 (popular move), then you have officially played The Vienna Gambit after you play F4. If your opponent is around 400~800, they will usually take your pawn with their E pawn which is a mistake.

1.Gives up their central pawn

2. allows the night to get kicked out back to it's starting square.  

3. allows you to play d4.

Since the move is a mistake we will punish them by kicking out the night and playing d4 which can look like this: 

Well, that was just the basics of The Vienna Gambit. For more information check out this wonderful course by Gotham chess. https://chessly.com/courses/812a7981-0439-4de4-a86b-35b9833eea25

I suggest you use the free sample, but buying this course will unlock lessons that teaches you other strong openings. So, they are both highly recommended. If you want more content, please follow and friend me to get notified!! Good luck!