Hi the forum

Hi all,
I have owned a three of Android boxes over the last couple of years. One I got rid of because it stopped working and I didn't realize you could re-load the core program. One I got rid of because it was not responsive enough. I'm now on my third box and it sort of works, so I thought it was time I joined a forum in order to gain a little knowledge about the workings of these units. They seem to center around being a mobile phone that has been modified (I think that's simple enough for me).
I am a retired electronics engineer with some design and it skills, so learning about Android boxes shouldn't be too hard if I can get my head around the new terminology.
So guys expect questions.

Tony