Mini Research regarding Aerospace

donstenx

Hi guys. I am interested to do some research in this aerospace fields but I need some advise/ recommendation from you guys especially from the expert. Here's the topics :
a) composite materials (b) advanced aerospace alloys (c) aircraft aging;fatigue, corrosion & wear (d)Novel manufacturing and joining techniques for aircraft structures

Which one is the better and tell me why it is better.
Your help is very much welcome
Cheers!