I tried a lot of guided meditation apps like Calm, etc. None of them - NONE of them - compare with Sam Harris' Waking Up app. To call it an "app" does not do it justice -- it is a container of content, to which he and others contribute regularly. The theme for all content is always consciousness.

If you think free will exists, listen to Sam Harris's 1 hour series of audio on the topic. It will change your mind.

I wish we taught introspection and self-examination in public schools.