I'm 45 years old and unfortunately for me I've not been blessed with musical bones. My 9 year old Son has decided he wants to learn guitar, I sat and watched a couple of YouTube videos with him, but could see the frustration etched on his face. All enthusiasm for learning has dwindled. However I now wish to learn, I've plenty of time on my hands to learn. I'm wondering what is the best way to get started? Money is tight, so the cheaper the better. Are there any good apps, online videos or books that anyone could recommend?