Noida middle-class property: biggest mistakes to avoid?

Came across this video about Noida real estate for middle-class buyers. It talks about avoiding costly mistakes. I'm looking at options in Noida myself, and honestly, it's a bit overwhelming. The video didn't get into super specific examples, but it got me thinking. Kya aap logon ko lagta hai ki common pitfalls kya hain? What's the biggest mistake you've seen or made in Noida property? Any red flags for a middle-class budget?