How to trade with villagers

Find a village and locate a villager with a profession (farmer, librarian, etc.).

Interact with the villager by right-clicking on them.

Browse their available trades by scrolling through the trade menu.

Choose a trade by clicking on it, and make the trade by offering the resources/experience required.

Repeat steps 3 and 4 to make additional trades or to level up the villager's trade options.