[SeaBull]

Well, where do I start? First it depends on if you wish to use this in everday life or if you want to create a career in pentesting and cyber security. For everyday life learning about body language will be very beneficial, NLP (Neuro-Linguistic Programming) will also be a very BIG help, even simple things like paying attention to everyday conversations and how people respond to different topics and good or bad news can be good. You can learn a lot and create a lot of assumptions from this in itself. I can glist several books about each of these I have mentioned considering I have a few myself. The things I have mentioned as of now are the basics you should learn first. I can list more advanced subjects and tips as you go on. For a career I have a few books as well since they would be more contextual