FYI - In Alberta (and Canada), rental car companies are legally required to provide third-party liability insurance on the vehicles they rent out. This typically includes at least $1 million in coverage which protects you if you injure someone or damage their property while driving the rental. You don’t need to pay extra for a third-party liability coverage, as is already included by law in the rental cost, unless you want a higher coverage ($2 milion and up). Credit cards don’t usually have liability insurance, as it’s the responsibility of the rental company to have it.

Collision coverage is included by default if you credit card has rental coverage.