Kosciuszko was born in February 1746 in a manor house on the estate called "Mereczowszczyzna" near Kosow, (now Kosava, Belarus) in Nowogrodek Voivodeship, Grand Duchy of Lithuania, a part of the Polish-Lithuanian Commonwealth. His exact birthdate is unknown; commonly cited are February 4 and February 12. Kosciuszko was the youngest son of a member of the szlachta (nobility), Ludwik Tadeusz Kosciuszko, an officer in the Polish-Lithuanian Commonwealth Army, and his wife Tekla, nee Ratomska. The Kosciuszkos held the Polish Roch III coat of arms.

In 1768, civil war broke out in the Polish-Lithuanian Commonwealth, when the Bar Confederation sought to depose King Stanislaw August Poniatowski. One of Kosciuszko's brothers, Jozef, fought on the side of the insurgents. Faced with a difficult choice between the rebels and his sponsors--the King and the Czartoryski family, who favored a gradualist approach to shedding Russian domination--Kosciuszko chose to leave Poland. In late 1769, he and a colleague, the noted artist Aleksander Orlowski, were granted royal scholarships, and on October 5 they set off for Paris. They wanted to further their military education, but as foreigners they were barred from enrolling in French military academies, and so they enrolled instead in the Royal Academy of Painting and Sculpture. There Kosciuszko pursued his interest in drawing and painting and took private lessons in architecture from the noted French architect Jean-Rodolphe Perronet.  Kosciuszko, however, did not give up on improving his military knowledge. He audited lectures for five years and frequented the libraries of the Paris military academies. His exposure to the French Enlightenment, along with the religious tolerance practiced in the Polish-Lithuanian Commonwealth, strongly influenced his later career. The French economic theory of physiocracy made a particularly strong impression on his thinking. He also developed his artistic skills, and while his career would take him in a different direction, all his life he continued drawing and painting.  In the First Partition of the Polish-Lithuanian Commonwealth in 1772, Russia, Prussia and Austria annexed large swaths of Polish-Lithuanian territory and gained influence over the internal politics of the reduced Polish and Lithuanian states. When Kosciuszko finally returned home in 1774, he found that his brother Jozef had squandered most of the family fortune, and there was no place for him in the Army, as he could not afford to buy an officer's commission. He took a position as tutor to the family of the magnate, province governor (voivode) and hetman Jozef Sylwester Sosnowski and fell in love with the governor's daughter Ludwika. Their elopement was thwarted by her father's retainers. Kosciuszko received a thrashing at their hands, an event that may have led to his later antipathy to class distinctions.  In the autumn of 1775, he decided to emigrate to avoid Sosnowski and his retainers. In late 1775, he attempted to join the Saxon army but was turned down and decided to return to Paris. There he learned of the outbreak of the American Revolutionary War, in which the British colonies in North America had revolted against the crown and begun their struggle for independence. The first American successes were well-publicized in France, and the French people and government openly supported the revolutionaries' cause.

Was that the extent of his military learning?
He also developed his artistic skills, and while his career would take him in a different direction, all his life he continued drawing and painting.