Baby XSS 01
Try to start learning XSS from here! This is a simple example of what we say Reflected XSS.
Baby XSS 02
Your next step is this one! This kind of XSS is called DOM-based XSS (or DbXSS, in short).
Baby XSS 03
This challenge seems to be more difficult than 01 & 02. (NOTE: I believe this needs user interaction.)
Baby XSS 04
Baby XSS 01 - 03 might be too easy for you, but you are still a baby until you solve this one :-)