Why do you think Yahweh revealed himself in this way to Isaiah? In what ways does this vision reveal God’s majesty? He wanted to show Isaiah His majesty, which he did, by being on a throne, having a robe that filled the temple, having seraphim constantly praising him, the shaking of the post if the door and the smoke that filled the house.
What do we learn about Yahweh from the serphaim’s chan? We learn that He is Holy and the whole earth is filled with His glory. The repeating of the work holy could be just emphasis but it could also be Holy Father, Holy Son and Holy Spirit.