Basic life support course 2020 guidelines from the American heart association can be read here for free. You need to login, only if you want to record your course progress.
This course teaches both single-rescuer and team basic life support skills for application in both in-facility and prehospital settings.
The BLS Course trains participants to promptly recognize several life-threatening emergencies, give high-quality chest compressions, deliver appropriate ventilations and provide early use of an AED.
Source for the above information : AHA website