I know he won independence for Ghana, was somewhat socialist and later he carried out crackdowns on opposition parties and the press with the stated reason being to prevent imperialists regaining ground in the country before being overthrown in a military coup that was allegedly backed by the CIA. But beyond that I don't really know anything about him, curious if anyone has any recommended further reading beyond just his wikipedia page
Neo-Colonialism, the Last Stage of Imperialism is a must read for leftists
Nkrumah is one of the architects of pan-Africanism and his impacts in that regard are legendary, he permanently changed the way that Africans and new Afrikans would view the process of decolonisation and liberation.
Ghana has a lot of workers co ops and community organizations still today and I have several friends who have visited and had a great time