Giving notice of resignation
Do I have to give notice when I quit a job?
In Canada generally and Ontario specifically you probably should give notice but it might not be an absolute requirement in all circumstances. Two excellent articles linked at the close of this nugget will be helpful.
Our general rule would be to act like a professional.
Honour your current employer and don't burn bridges…don't risk potential references.
Understand the terms of your employment contract if you have one.
This nugget is not meant to provide legal advice. Consult an employment lawyer if you have any concerns.