Read the Dwarf language and obtain it before you can trade with the dwarves on the right side of the mine and the dwarves on the fifth floor of the volcanic cave. After collecting all four dwarf scrolls and donating them to the museum, you can get the Dwarf language tutorial from Gunther.
"Stardew Valley" Dwarf Tutorial Function Introduction
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Understand the Dwarven language. After obtaining it, you can trade with the dwarves on the right side of the mine and the dwarves on the fifth floor of the volcanic cave, and understand some interesting content.
How to get it
Collect four kinds of dwarf scrolls (red is dwarf scroll 1, green is dwarf scroll 2, blue is dwarf scroll 3, and gold is dwarf scroll 4). After donating them to the museum, you can find Gunther to receive the dwarven language tutorial, below How to obtain each scroll
Dwarf Scroll 1: If you kill monsters before the 40th floor of the mine, there is a 0.5% chance of dropping it.
Dwarf Scroll 2: Killing blue slimes, dust elves (briquette monsters), frost bats, and ghosts all have a 0.5% chance of dropping them, that is, spawning monsters between the 40th and 69th floors of the mine.
Dwarf Scroll 3: Spawn monsters after the 40th floor of the mine. Most of the monsters that appear on these floors have a 0.5% chance of falling. Among them, the probability of blue slimes falling is three times that of other monsters, which is 1.5%.
Dwarf Scroll 4: All monsters have a 0.1% probability of dropping. It is recommended to dig in the soil with a hoe on the 93rd floor of the mine. The drop rate should be much higher than killing monsters. I mined it on the 93rd floor.