RERA compliance and title verification in Mohali projects?

Mohali IT Park area — been looking at a 3BHK in SBP Group's project there, around ₹1.5 Cr. Honestly, I work in real estate but for my own investment, I'm extra cautious about legal due diligence. How do you guys *actually* verify RERA registration beyond just checking the number? What red flags in their RERA filings should I look for? Also, title verification mein, Encumbrance Certificate ke alawa aur kya important hai check karna *before* I even think about booking? Bahut log skip kar dete hain. Aur RERA complaints Chandigarh mein kitni effective hain? Is it just on paper or genuinely helps if the builder delays? Want to ensure my capital is safe.