Two or three things I know for sure, kinda sorta

In all the year-end roundups on the various blogs, I enjoyed David Cain's 16 things I know are true but haven’t quite learned yet. I already knew and practice #2 but several, like #s 1, 3, and 6 -- I still struggle with those. (But substitute MacBook for smartphone.) It made me think of a few things I know that I am still learning are true for me.