Introducing myself

Hi, Good morning folks,
I am a retired old fellow. I live in Auckland city of New Zealand. I love classic music, and general repairing. Having retired, in order not to prevent my brain from becoming rusty too fast, I used a lot of time in 2010 in learning Excel formula from various sites on the internet and had worked out a workbook composed of 5 sheets to manage my son's accounting tasks. While the created workbook is working pretty smoothly, I found there are still many things about Excel I want to learn so I join this forum.