Noida real estate: What did you wish you knew earlier?

Under-construction projects mein, builder payment plans are a total trap. Just moved into my Gold Homes Infra Pvt Ltd flat in Sector 162 last month, and things nobody told me: the 'construction linked' plan sounds great, but delays mean you're paying EMI *way* before possession. My possession was delayed by almost a year. Honestly not sure if it was worth the supposed discount. Should've probably gone for ready-to-move, even if it was slightly more expensive upfront. Anyone else face this? What are your thoughts on under-construction vs ready-to-move now after RERA? Also, what hidden charges did you guys discover after moving in? Koi tips and tricks for first time buyers?