It looks like I’m going to get into trouble if I keep using Wheezy. There will probably be no security updates after May 31, 2018, any more. Maybe I should switch to Jessie. Or perhaps Stretch. There is even a newer version “Buster” (Alpha 1). I think Jessie can be a good choice.
LTS stands for Long Term Support.
However, I do not like the idea that Wheezy sees the end of his life.