Gurgaon Sector 66: Under-construction lena risky hai kya?

Sector 66 — I'm looking at projects here, like Corona Group's. First time buyer hoon, so confused where to even start shortlisting. Builders ki promises pe kitna trust karein? Under-construction ka delivery risk kaise check karein? Site visit pe kya kya dekhna chahiye jo sales team nahi batati? Parents bolte hain mat lo.