Learning the ropes is made easier by the games structure decks, each of which focuses on a general concept - whether its fairly straightforward dragons or the more advanced Pendulum mechanics, which alter cards effects based on their position on the battlefield
Once per turn: You can send 1 "The Agent" monster from your Deck to the Graveyard, and if you do, this card's Level becomes the Level of the monster sent to the Graveyard by this effect
Pendulum Pendulum Summoning involves setting two "pendulum scales" using pendulum monsters, a type of monster that can act as a continuous spell in the Pendulum Zone or as a regular monster
Against Despia, neither card is particularly effective, which makes things quite tough, but if you have Called by the Grave, you can counter Branded in Red, which opens up a path to victory
This also sets up your graveyard nicely
If you stop Benten, you can't search for Eva or Drytron that turn either