Trying to buy my first flat, RERA ne sar ghuma diya

Been looking for a 2BHK in Noida Extension for months. Builder `info` ka `Shiv Krishna Valley` project dekh raha tha. RERA registration check karna kitna confusing hai. How do you verify a builder's legal track record, especially if there are past delays? Is RERA actually effective when builders default, or just on paper?