Are these hadiths Sahih?

Hadith about the conquest of India

Is the hadeeth “I have brought slaughter to you” saheeh, and how should it be understood?

How sound is the hadeeth “Husayn is of me and I am of Husayn”?

Can a hadeeth be accepted from a narrator who suffered from mental problems?

The hadeeth “Blessed is (Greater) Syria” is a saheeh hadeeth

The hadith: “Every matter that does not start with remembrance of Allah is incomplete”

A Superior Dhikr

Are there any saheeh ahaadeeth which speak of the ransoming of the living and the dead during Ramadaan?

Hadeeth about the one who is secure in his property