Since we’re all here trying to “level up” our lives through 10-minute videos, give me the real tea. What apps or books are actually worth it for learning skills that don't involve "mindfulness" or "tidying up"?

I’m looking for recommendations on how to learn high-level manipulation—I mean, "negotiation skills"—or maybe something like locksport so I can at least get into my own house when I inevitably lose my keys. Has anyone actually tried those "life-changing" productivity methods, or are we all just hoarding bookmarks we'll never look at? Send me your best tools for surviving this disaster of a century. 💀