Porter Jr. attended Father Tolton Regional Catholic High School in Columbia, Missouri, where he became a standout player on the basketball team. In his junior year, he led his team to the 2A State Championship, putting up impressive numbers along the way. However, it was during his senior year that Porter Jr. really made a name for himself.

Porter Jr. transferred to Nathan Hale High School in Seattle, Washington, for his senior year, where he played under the guidance of former NBA player Brandon Roy. In his first year at Nathan Hale, Porter Jr. averaged an impressive 36.2 points and 13.6 rebounds per game, helping his team to a perfect 29-0 record and the Washington Class 3A State Championship.

During his high school career, Porter Jr. was widely regarded as one of the top high school basketball players in the country, earning a five-star rating and ranking among the top overall recruits in his class by Rivals.com and ESPN. He also competed in the McDonald's All-American Game and the Nike Hoop Summit, where he was named the MVP in both events.

After his impressive high school career, Porter Jr. went on to play college basketball at the University of Missouri. Though he was hampered by injuries during his time there, he still managed to show flashes of the potential that would eventually lead him to the NBA. In 2018, Porter Jr. declared for the NBA draft and was selected by the Denver Nuggets with the 14th overall pick.

Today, Porter Jr. is one of the most promising young players in the league, known for his scoring ability and athleticism. And while he may have left his high school and college days behind him, his impressive performances on the court continue to make waves in the world of basketball.