The best advice to King Duncan about going to Macbeth's home would be, "Do not let down the guard."
But this advice is after the fact. Given the loyalty and love to each other, King Duncan could not have lived in fear of Macbeth's conspiracy. After all, the witches did not forewarn him that Macbeth and his lady were plotting his assassination.
Macbeth was too ambitious to have murdered King Duncan in his home. He was too desperate to become a king. On King Duncan's part, how could he have questioned the nobility and loyalty of Macbeth, whom he recently crowned "Thane of Cawdor?"
Thus, the best advice to King Duncan would be that he should maintain his security details in and around Macbeth's house but without putting too much reliance on them when the gods are involved.
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