In this video, the instructor discusses one of the very least known gambits but still gives black plenty of appealing play; this is called as Budapest Gambit. White might be caught into a trap that could lead into a checkmate after few minutes the start of the game; this is when the execution of the Budapest gambit is very well done.
Black seems to sacrifice the e5 pawn in the main move yet then begins to stem of the minor pieces to put pressure at the pawn on the e5 spot. It is impossible for white to hang on to the reserve pawn, and thus there are a lot of times white will just restore the pawn and will keep doing some developmental moves using its minor pieces and not fret about the on-going pawn advantage situation.
The narrator indicates that the side with most materials being sacrificed in almost all kinds of gambit will state how the game will proceed, but the Budapest gambit is different, because it is usually white deciding how the game will move forward. In the main line, white can choose whether to stick to the plan, then acquire doubled pawns or replace the pawn with a pair of double bishops. We see that white does have more choices in the Budapest than any other gambits.
Check the video for more detailed explanation about the Budapest Gambit.