Why is the market falling

I’m new to investing and want to understand how markets work and how the economy runs. I’ve noticed the market is falling, and I’ve read that it’s due to factors like the Fed reducing interest rates, FIIs selling, and war. However, I don’t fully understand these dynamics. Why does the Fed reducing its interest rates impact the Indian market? Are FIIs selling because they’ve found better opportunities in countries like China or Japan? Why are people so concerned about war? Also, why isn’t the government or RBI doing anything to prevent investors from leaving? Isn’t this a bad sign since it could reduce the amount of capital available in the market? Lastly, why aren’t our domestic mutual fund houses investing in foreign markets to balance this?