I haven’t read all the prior comments but I would suggest to learn the basic of electricity. Despite the biggest part of electronics is low voltage you may meet some parts with higher voltage. Learn the dangers what to look out for and what to avoid at any cost. Safety at first no matter what!!!

If you can get some technic beginner books or PDFs from middle schools your good to go. After that you can look for broken electronic at your local Craigslist or what ever it’s called in your area/country and start to dismantle them and source for parts.

And trust me about the security and dangers at this one. Working as a certified industrial electronic technician in Germany since 2011…