Fingers-interlaced, white-knuckle-hard clamshell direct pressure right at the point of bleeding is very effective, quickly applied with very little training, and requires no additional equipment.
In our race to use tourniquets for controlling hemorrhage, we often lose sight of the value of good direct pressure as a hemorrhage control technique.
Proven commercially available tourniquets are almost always going to be better options for controlling significant extremity hemorrhage than direct pressure because tourniquets can be made “hands-free” once secured in place. Additionally, you can carry many more tourniquets than you have hands. However, dedicated medical equipment may not always be available and even when present, takes time to put into action. See the blog for more information.

...one of the top 10 trainings I've taken. Period.

My Lt asked me to evaluate the course and see if it was something we should offer to the rest of the agency. After taking this course, I am giving him a resounding yes.
In 25 years of LE experience, I have sat through HOURS of in-person and online training. This is by far one of the best online courses I have ever taken. I might even say the top 10 trainings period. The Dr. was informative, engaging and enjoyable to watch.

Note: this video is not taken from the online course which was professionally filmed on a sound stage in Portland, Oregon, but does cover information covered in the course. This skill is so crucial that it is worth highlighting the blog and informational video on the subject.