How do i start Practising algorithm on codechef

can anyone guide me on how to get started with algorithm training on codechef ?

CodeChef is not a training center. It is for practice, compete and discuss. So, If you have any problem with understanding algorithm then you should see another training institute or ask for a link.
Here is a link of video tutorial of algorithm by MIT. I think that will help you.
MIT 6.006 Introduction to Algorithms, Fall 2011