السلام عليكم ورحمة الله
1-Fitna means Sedition or seduction in all aspects of life ( women, children, money, food, cars, nature..etc.).
"And know that your possessions and your children are a test, and that with Allah is immense reward. (28)".[quran 8:28]
where sidition or seduction is a test from Allah(swt).
2-Fatwa is the opinion or consult of a scholer or Imam ( like Bukhari, Imam Shafi'i or Malik..etc) regarding a matter, based of quran, sunna, or measured by comparison to a similar situation in the past.
"They consult thee concerning women. Say: Allah giveth you decree concerning them, and the Scripture which hath been recited unto you (giveth decree), concerning female orphans and those unto whom ye give not that which is ordained for them though ye desire to marry them, and (concerning) the weak among children, and that ye should deal justly with orphans. Whatever good ye do, lo! Allah is ever Aware of it. (127)".[quran 4:127]
3-As for hitting women:
a. If your not allowed to touch a strange woman, then obiviously you can't hit her.
b. if she's your wife:"Men are in charge of women, because Allah hath made the one of them to excel the other, and because they spend of their property (for the support of women). So good women are the obedient, guarding in secret that which Allah hath guarded. As for those from whom ye fear rebellion, admonish them and banish them to beds apart, and scourge them. Then if they obey you, seek not a way against them. Lo! Allah is ever High, Exalted, Great. (34)"[quran 4:34]
notice that he(swt) said:"scourge", as in a slight whip anywhere but not on the face".
when he was asked about a wifes right, Allah’s Messenger [sallallahu ‘alayhi wa sallam] said:"That he should feed her whenever he eats and cloth her whenever he clothes himself, that he not hit her face, that he not call her ugly and that he not boycott her except within the house".[Ibn Majah]
OR "Feed her when you feed yourself, clad her when you provide yourself with cloth, neither hit her on the face nor use impolite language".[Tirmidhi]