First investment jitters: Gurgaon legal checks

Okay I'll be honest — I completely underestimated how confusing this property buying journey is. I'm eyeing a 2BHK around Dwarka Expressway, maybe M3M Heights or something similar, budget around 1.5-2 Cr. This is my first investment, so I'm super cautious. Everyone says check RERA, but what exactly should I look for beyond just the registration number? Like, are there common red flags in the documents? And how do you *really* verify a builder's legal track record? Like Salcon or Saluja Constructions, how do I dig into their past projects, any unresolved issues? My parents keep saying 'title clear hai na?', but I had no idea what that even means for a new project. What are the absolute must-do legal checks before signing anything? Ab samajh nahi aa raha if I'm missing something crucial.