Lands represent your resources in Magic. Above are some examples of lands you will see.
On each one of your turns, you may play 1 land from your hand onto the battlefield. Once there, these lands can be used (once each turn) to give you the mana that you need to summon creatures and cast spells.
Tap
Black mana
Untap
To use a land to make mana, you "tap" it by turning it sideways.
Each land will only produce 1 mana unless otherwise stated.
This Swamp will tap for one Black Mana. This Black Mana can be used to cast spells which need black.
When a land is tapped, it does not untap until your next turn.
See what this looks like by clicking the tap and untap buttons.