4. Decks
Once you have created some cards, you can organise them into decks.
For each deck, you just specify a quantity of each card. You can add each card one by one, or can bulk add them.
If you have a fantasy game, you might create a wizard deck, and a monsters deck.
Once your decks are created, you can use the Output tab to print them out, or the Play tab, to export them for playing online.