After years selling, buying my own Noida property is different

Noida Extension mein ek plot dekh raha tha. I work in real estate, but for my own investment, I'm super cautious. MMR Group projects bhi dekhe. RERA registration check kaise karte hain practically? Matlab, website pe bas number dekh ke ho jaata hai ya aur deep dive karna padta hai? Aur title verification ke liye kya steps hain jo log often miss kar dete hain? Koi hidden red flags batao please.