en_tn_condensed/num/09/01.md

in the first month of the second year after they came out from the land of Egypt

This means that they had come out of Egypt a year earlier. They were beginning their second year in the wilderness.

in the first month

This is the first month of the Hebrew calendar. It marks when God brought the people of Israel out of Egypt.

after they came out from the land of Egypt

"after they left the land of Egypt". Here "they" refers to the people of Israel.