What checks does IRCC do after Quebec selects me as a skilled worker?

Quebec selection (the CSQ) confirms Quebec wants you, but it does not finalise your immigration. The second step is a federal application to IRCC, which assesses admissibility to Canada under federal law.

As part of this, you and your accompanying family members must pass medical examinations as well as security and criminality screening. These checks are standard for permanent residence, so prepare to complete a medical exam and provide police certificates as requested to avoid processing delays.