Confused about builder verification in Greater Noida

Noida Extension mein 3BHK dekh raha hoon. Ultra Home Construction Pvt Ltd ka ek project dekha hai. Kids ke school aur safety important hai. Builder ka RERA registration kaise check karte hain properly? Matlab, sirf website pe naam hona enough hai ya aur kuch dekhna padta hai? Builder ka past track record bhi confirm karna hai.