What do we know about Jesus childhood?

Of His childhood little is known, except for one visit to Jerusalem with His parents.
He was also trained as a carpenter.

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Luke 2:40-52 — The Child continued to grow and become strong, increasing in wisdom; and the grace of God was upon Him.
Now His parents went to Jerusalem every year at the Feast of the Passover.
And when He became twelve, they went up {there} according to the custom of the Feast;
and as they were returning, after spending the full number of days, the boy Jesus stayed behind in Jerusalem. But His parents were unaware of it,
but supposed Him to be in the caravan, and went a day's journey; and they {began} looking for Him among their relatives and acquaintances.

Mark 6:3 — ~"Is not this the carpenter, the son of Mary, and brother of James and Joses and Judas and Simon? Are not His sisters here with us?" And they took offense at Him.