Help to fill in the "easy trade buy order" form

#1
Hi,

I am a new user and want some help in understanding the the fields "order type" and "product code". The drop down menu has three options for the order type viz LIMIT , MARKET and SL-L. I am not sure about which one to select, by default though it is showing LIMIT. THe same for product code, it has CNC, MIS and NRML as the options. Could somebody please explain the meanings.

Madhura