Question

it said that turks conquer India only because the Indian rulers failed to stand against them what lesson did important to the future generation

Answer 1

Indian rulers failed that time to stand against foreign aggression because they were not united that time and were fighting between them selves and the invader took the advantage of this.

This clearly teaches the future generations that when we are united we can face any problems but when we are divided our enemy can took advantage of this and they will win.
"united we stand divided we fall"is the main message

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