en_tn_condensed/isa/45/12.md

General Information:

Yahweh continues speaking.

It was my hands that

Here the word "hands" represents Yahweh. Alternate translation: "It was I who" (See: rc://en/ta/man/jit/figs-synecdoche)

stretched out the heavens

Yahweh speaks of creating the heavens as if they were fabric that he stretched out. See how you translated a similar phrase in Isaiah 42:5.