In order to work in Canada, you will often need a work permit. This is usually linked to what is called a Labour Market Impact Assessment (LMIA), which serves as proof that no Canadian is available to fill the job you are applying for. If you are exempt from this requirement or have received a positive LMIA, you should gather your documents and submit your application to IRCC either online or by mail.
It is important to ensure that all your paperwork is complete and truthful. Incomplete applications will be returned, and providing false information could result in being banned from entering Canada for several years. The work permit will contain your personal details and the rules you must follow. Ignoring these rules could lead to deportation or your future applications being denied. The permit will specify your name, address, employer, and work location. However, it is important to note that it does not allow you to re-enter Canada if you need to travel outside the country.
To avoid any gaps in employment, you should apply for a permit extension before your current permit expires. This will allow you to continue working under "implied status" while your application is being processed. If you miss this deadline, you have a maximum of 90 days after the permit expires to rectify the situation. During this period, you are not permitted to work until the issue is resolved.