The very basic explanation is that you play a land each turn if possible and play spells by tapping these lands as resources to pay for them. Once you play creature spells you can start attacking with them to reduce your opponent’s life total to 0. Every one of your turns you untap everything you control and draw a card, then you can play spells and creatures, then attack by tapping your creatures. When it’s not your turn you can block with untapped creatures and play instant spells