Decrypting BRT

Dear fellow redditors, I’m writing this to please let me know if one has to go from Abdara Road to Iqra University in express route what bus to hop in? And by the way do ER buses touch Abdara Stop? And while ER 16 and ER 1 are famous, what are XER for!? Ya yahan sab log elite hain? Apni gaadi se hi travel krte hain?