Things nobody tells first-time buyers about site visits

Since January, I've been shortlisting flats in Greater Noida. Honestly, I'm a bit overwhelmed, especially being a first-time buyer. Elite Group ke projects Sector 140 mein dekh raha hoon. Site visits pe jaa raha hoon, par samajh nahi aa raha kya-kya check karna chahiye. Builder toh sab accha hi batata hai. Kya koi bata sakta hai site visit pe kya critical cheezein dekhni chahiye jo builder nahi batate? Like, construction quality kaise judge karein? Aur under-construction project mein delivery risk kaise evaluate karein? Parents bolte hain ready-to-move lo, but budget thoda tight hai. Koi tips for a first-timer? Kya Elite Group ka track record sahi hai? Bahut confuse hoon abhi.