Example: Queen’s Gambit, 1.d4 d5 2. c4, 3 plies.
Gambit list

Gambits.....with moves...
https://www.angelfire.com/nf/chess/Gambits.html
https://en.wikipedia.org/wiki/List_of_chess_gambits
https://www.mark-weeks.com/aboutcom/aa04g10.htm
https://www.mark-weeks.com/aboutcom/aa04g31.htm
https://www.ianchessgambits.com/
The Chess GAMBITS Tier List for Beginners – GM Hikaru Nakamura and IM Levy Rozman…
https://www.youtube.com/watch?v=S9N6Bo7BBPg
Add any (existing) gambit to the Gambit List! Say the name, most common move-order to get there, and number of plies (1/2 moves).