It is not very hard to use a cutting board. Most people use a cutting board to cut food up to whatever size they want. There are some sites below on giving you advice of using cutting boards and also some different types of cutting boards.
That's to prevent cross-contamination. If you use a cutting board for raw chicken, then use the same cutting board (without appropriate cleaning and sanitizing), the bacteria from the raw chicken can contaminate the cooked chicken and cause illness in those who eat it.
It is important that a cutting board be secure to avoid slipping while using a sharp knife and possible cutting oneself. Using a damp dish towel on top of the counter, set the cutting board on top of the towel and it will stay secure.
A cutting board protects both your countertop (or table top) and your knife. It protects the countertop (or table top) from scratches and gouges and it protects the knife from dings and nicks and dulling.