Sahih Muslim, Book 4, Number 1422
Narrated Jabir ibn Abdullah: "The Prophet (ﷺ) said: He who has a slave-girl and teaches her good manners and improves her education and then manumits and marries her, will get a double reward; and any slave who observes Allah's right and his master's right will get a double reward."

Quran 4:34 "Men are in charge of women by [right of] what Allāh has given one over the other and what they spend [for maintenance] from their wealth. So righteous women are devoutly obedient, guarding in [the husband's] absence what Allāh would have them guard. But those [wives] from whom you fear arrogance - [first] advise them; [then if they persist], forsake them in bed; and [finally], strike them. But if they obey you [once more], seek no means against them. Indeed, Allāh is ever Exalted and Grand."
The Prophet (ﷺ) said, "Isn't the witness of a woman equal to half of that of a man?" The women said, "Yes." He said, "This is because of the deficiency of a woman's mind." - Sahih al-Bukhari 2658
Prophet Muhammad is right.

Islam is right about sub-saharans, it's right about homosexuals and it's right about women.