Background
Krstić was born in the village of Labuništa, close to Struga (present day Republic of Macedonia, then in Ottoman Empire) in a family of pečalbari, families who went away from their homeland to earn for living but kept close connections to their homeland. His father, Martin, worked as a milkman in Belgrade and Andjelko joined him at young age. His father opposed his decision, took him back to native Labuništa and pressed him to marry, aged only 17.
However, Andjelko decided to oppose his father more resolutely when he wanted to take him to work with him in Romania.
Education
Instead, he returned to Belgrade and started working as a milkman assistant with his compatriot Marko Šumenković while in the evenings he attended school lessons.
Career
Professors soon noticed his diligence and helped him with a small stipend. He graduated in August 1889 with excellent grades. Despite an offer to stay in Belgrade Krstić decided to go back to his native village.
Back in Macedonia, despite many obstacles imposed by the Ottoman authorities and Bulgarians, he managed to open a school in the neighboring village of Podgorec.
He was arrested for his patriotic work several times. In 1911 he became the principal of all the Serb schools Debar, Struga and Ohrid areas.
In 1924 he was offered by Bora Stanković a post in the Ministry of Education in Belgrade. Although he hesitated in 1940 he was appointed as an editor of Glas juga newspaper from Skopje, where he remained until the occupation in 1941.
Krstić, modest as he was, spent the most of his life where he was born.
He died in 1952 and was, by his own wish, buried on a hill underneath Mount Jablanica.