A maze!

The whole PhD is a big maze! Soem times you feel you are close, very close to the end, just a few steps and then woohooo! But then you realise that no way! You even lost your path!
Just when I thought that I have learnt form Saldana and I can start my coding, I realised that no way! I dont know what Im looking for! Any thing special? Any difference? Any similarities? I just simply don't know!