What is the meaning of Isaiah 1:1?

The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem in the days of Uzziah, Jotham, Ahaz, [and] Hezekiah, kings of Judah. (Isaiah 1:1 KJV)

The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem, in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah. (Isaiah 1:1 ASV)

The vision of Isaiah the son of Amos, which he saw concerning Judah and Jerusalem in the days of Uzziah, Jotham, Ahaz, Hezekiah, kings of Judah. (Isaiah 1:1 DBY)

The vision of Isaiah the son of Amoz, which he saw concerning Judah and Jerusalem, in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah. (Isaiah 1:1 WEB)

The Visions of Isaiah son of Amoz, that he hath seen concerning Judah and Jerusalem, in the days of Uzziah, Jotham, Ahaz, Hezekiah, kings of Judah. (Isaiah 1:1 YLT)

Interlinear

The vision <chazown> of Isaiah <Y@sha`yah> the son <ben> of Amoz, <‘Amowts> which he saw <chazah> concerning Judah <Y@huwdah> and Jerusalem <Y@ruwshalaim> in the days <yowm> of Uzziah, <`Uzziyah> Jotham, <Yowtham> Ahaz, <‘Achaz> and Hezekiah, <Y@chizqiyah> kings <melek> of Judah. <Y@huwdah>   (Isaiah 1:1 KJV)

Patrick/Whitby/Lowth/Lowman Commentary

The vision of Isaiah the son of Amoz, The two usual ways whereby God communicated his will to the prophets, were visions and dreams (Nu 12:6). In vision the inspired person was awake, but his external senses were bound up, and as it were laid asleep in a trance. Thus Balaam describes it as to himself, “Who saw the vision of the Almighty, falling into a trance, but having his eyes open” (Nu 24:16). It is called vision, not from any use made of corporeal sight, or that it is entertained with external objects; but because of the clearness and evidence of the things revealed, and the conformity this kind of inspiration bears to the information which the mind receives by corporeal sense. Though sometimes vision is accompanied with external representations; as when Isaiah saw the glory of the Lord “sitting in his temple” (Isa 6:1), and Ezekiel had the description and dimensions of the temple revealed to him in a vision (Eze 40:2), and St. John had a sight of the “new Jerusalem coming down from heaven” (Re 21:10).

Which he saw concerning Judah and Jerusalem. His prophecy does chiefly relate to the kingdom of Judah, though he does accidentally speak of the ten tribes, as he does also of the Moabites, Egyptians, &c., the kingdom of Judah itself being concerned in the good or ill which befell their neighbours.

This probably was not the first vision which Isaiah had (see note on PLWL for Isa 6:1), but is placed at the beginning of his book; because this and the four following chapters contain a general description of the state and condition of the Jews, under the several judgments which God had brought unto them, and are a fit preface or introduction to the rest of his prophecy.