Greater Noida: Apex Group possession, agreement red flags?

Kya Apex Group ke under-construction projects mein possession delays ka issue hai Greater Noida mein? My parents keep saying check builder-buyer agreement thoroughly for red flags. Honestly, I had no idea about legal verification steps like RERA check ya title search. First-time buyer hoon, thoda nervous feel ho raha hai. Koi bata sakta hai agreement mein kya dekhein, especially for delivery risk? Ab samajh nahi aa raha kaise evaluate karun.