So kiddo, the Earth is a big round ball, right? And we have imaginary lines on the Earth called latitude and longitude lines. These lines help us find specific places on the Earth.
The 58th parallel north is one of those lines of latitude. It's a line that goes all the way around the Earth at a point that is 58 degrees north of the equator. The equator is an imaginary line that goes around the Earth right in the middle, and it splits the Earth into two halves, the northern hemisphere and the southern hemisphere.
So when we say the 58th parallel north, we're talking about a point on the northern half of the Earth that's 58 degrees away from the equator. It's pretty far up north, but people still live there and go exploring and do all sorts of neat things.
Does that make sense, kiddo?