[2] On January 24, 2017, Goodwin posted 26 points and 10 rebounds in a 74–64 win over Mount Vernon High School, passing Kevin Lisch as Althoff's all-time leading scorer.

After the game, he underwent season-ending surgery for a partially torn labrum in his left shoulder, which had been occasionally bothering him for two years.

[3] Goodwin played for the St. Louis Eagles on the Amateur Athletic Union circuit and had success at the Nike Elite Youth Basketball League.

[4] A consensus four-star recruit, he committed to playing college basketball for Saint Louis over offers from Alabama, Butler, Creighton, Illinois, Missouri and Northwestern.

[6] On January 13, 2018, Goodwin recorded the first triple-double in Saint Louis history, with 13 points, 15 rebounds and 10 assists in a 76–63 win over Duquesne.

[8] Goodwin was suspended for the remainder of his freshman season for a violation of university policy after he was one of four players accused of sexual assault, although no charges had been filed and he was later cleared.

[16] Goodwin was named to the first-team All-Atlantic 10 and Atlantic 10 All-Defensive team after breaking Saint Louis's record for steals.

Goodwin joined the Wizards during the 2022 offseason for training camp and had his deal converted to a two-way contract on October 15, 2022.