My own home hunt: Sohna's legal maze

Since January I've been shortlisting flats in Sohna, and honestly, buying for myself feels totally different than for clients. I know what builders don't tell you. Specifically looking at JMS The Nation on Sohna Road, but VK And Sons Infratech jaise builders ka legal track record kaise verify karein? RERA registration kaise check karein properly for red flags? Agar builder delay karta hai, RERA mein kya real options hain, ya sirf paper pe hi sab sahi lagta hai? Koi actual experience share karega?