Can we work full time if we have break between Two different program. like if my first program completed in September-2018 and my second program starts on January-2019. So, can i work full time during these break?
No you cannot work at all not even part time between 2 different courses to do so would be considered illegal work and could affect any future applications. This is on the basis that in this time you would not be in continuous full time education education to meet the study permit condition that would allow working on a scheduled break .