To work legally in Canada, you generally need a work permit or another authorization to work. Here are some of the most common types of work permits and authorizations you might need:

1. Temporary Work Permits: This is the most common type of work permit for people who want to work in Canada temporarily. Temporary work permits are usually job-specific, meaning they are tied to a specific employer and job position. You may need a job offer from a Canadian employer and a positive Labour Market Impact Assessment (LMIA) from Employment and Social Development Canada (ESDC) to apply for this type of work permit.
2. International Experience Canada (IEC): IEC is a program that allows young people (usually aged 18-35) from partner countries to work and travel in Canada for up to two years. There are three categories under IEC: Working Holiday, Young Professionals, and International Co-op (Internship). Participants do not need a job offer to apply but must meet the eligibility criteria for their respective category.
3. Intra-Company Transfers: If you work for a multinational company with offices in Canada, you may be eligible for an intra-company transferee work permit. This permit allows employees to transfer to a Canadian branch, subsidiary, or affiliate of their company.
4. NAFTA Professionals: If you are a citizen of the United States or Mexico, you may be eligible to work in Canada under the provisions of the North American Free Trade Agreement (NAFTA), now known as the Canada-United States-Mexico Agreement (CUSMA). Certain professionals, such as engineers, accountants, and computer systems analysts, can work in Canada under this agreement without an LMIA.
5. Post-Graduation Work Permit (PGWP): International students who have graduated from a Canadian post-secondary institution may be eligible for a PGWP. This permit allows recent graduates to work in Canada for up to three years, regardless of their field of study.
6. Spousal/Open Work Permits: If you are the spouse or common-law partner of a student or skilled worker in Canada, you may be eligible for an open work permit, which allows you to work for any employer in Canada without a job offer.
7. Bridging Open Work Permit: This permit is for individuals who are waiting for a decision on their permanent residence application in certain immigration categories. It allows them to continue working in Canada while their application is being processed.

It’s important to note that the requirements, eligibility criteria, and application processes can vary depending on the type of work permit or authorization you are applying for. Additionally, some professions may require certification or licensing from a regulatory body in Canada.

Before applying for a work permit or authorization, it’s advisable to consult with an immigration professional or visit the official website of Immigration, Refugees and Citizenship Canada (IRCC) to ensure you meet the necessary requirements and understand the process thoroughly.