en_tn/dan/01/04.md

without blemish

These two negative words together emphasize a positive idea. Alternate translation: "with perfect appearance" (See: rc://en/ta/man/jit/figs-litotes)

filled with knowledge and understanding

This is an idiom. This means they knew much and could organize and use that information. (See: rc://en/ta/man/jit/figs-idiom)

king's palace

This is the large house or building where the king lives.

He was to teach them

"Ashpenaz was to teach them"

educated men

Or "Chaldeans." This phrase translates a word that refers to a group of men whom people thought had special knowledge. Because the language they spoke is elsewhere called "Aramaic," the author was probably referring to group of men, rather than the people group or their language, here.