What builders won't tell you during site visits?

Site visit ke time kya kya dekhte hain? KCC Contractors & Engineers ka project Sector 12, Noida Extension mein dekh raha hoon. Under-construction hai, toh delivery risk ka bahut darr lag raha hai. Kya questions poochne chahiye builder se jo woh khud nahi batayenge? Koi checklist hai toh share karo please. First time buyer hoon, abhi tak sirf brochures dekhe hain.