Greater Noida investors: Legal checks for future buys?

Just went through the buying process for my flat near Pari Chowk last month. Honestly, legal checks were a nightmare. For future investments, especially in Noida Extension, how do you guys properly verify RERA registration for projects like Parsvnath Privilege Phase IV? Kya red flags dekhne chahiye? Also, title verification mein kya steps hain jo log miss kar dete hain? I don't want to mess up again.