Hello, Do you know about courses or trainings about hardware hacking to complete the hardware hacking challenges?
I think the simplest answer is just Curiosity - think about a gadget that you’d like to know how it works, or a project involving hardware or electronics you think would be cool, and then break it down to simpler pieces and follow your curiosity in exploring how to get answers that get you there. If you need some inspiration, check out this sub, places like hackaday.com, and great (and accessible channels) on Youtube like Ben Heck Hacks and Joe Grand.
Once you get a feel for what takes your fancy, you can look deeper into those topics - security-focused hardware hacking might take you through hacking IoT devices and attacking embedded Linux; electronics hacking might take you through circuit bending and art installations. It’s an endlessly deep and rewarding hobby, so just jump in with something you’re curious about!
Finally, this is very heavily biased towards security-research and IoT hacking, but there’s a great list of books, tools, papers, etc here: GitHub - fkie-cad/awesome-embedded-and-iot-security: A curated list of awesome embedded and IoT security resources.