Scandinavian defense
The scandinavian while it has it own respectable ideas, is not as strong as the other options black can play (e5, c5, e6, c6)
Personally, I have recommended the Scandinavian to some beginners as it is relatively simple to play, and your typical beginner would not be able to "punish" the opening
Scandinavian Defence is a respectable opening. It has been played by many grandmasters.
Here is an example where black defeated the then reigning World Champion with it.
https://www.chessgames.com/perl/chessgame?gid=1068107
Here is an example where Carlsen played it in the Chess Olympiad
https://www.chessgames.com/perl/chessgame?gid=1768345