The title LORD of Hosts in English invokes the idea of a Being that commands both the cosmos and spiritual beings. All creation is ordered and marshaled by Him. It is a title of the LORD which indicates His supreme creative omnipotence.
In Hebrew YHWH Seva’ot, is always plural, which in Hebrew does not necessarily mean more than two, but can indicate great, large or important.
“Holy, Holy, Holy, is the Lord of hosts, The whole earth is full of His glory”. Isa 6:3
Common misunderstanding
There are some people who think and/or teach that the hosts of God are angelic forces. They use Rev 12 as their proof text.
His tail swept down a third of the stars of heaven, and cast them to the earth. And the dragon stood before the woman who was about to bear a child, that he might devour her child when she brought it forth; Rev. 12:4