I bought a Mac because I do not want to have to replace it any time soon. If all goes well, this computer will last as long as I do -- or, at least, as long as my eyesight and wits do.

The problems I'm having now arise from ignorance -- I do Windows things because I don't know what the Mac thing is, or don't know that a Mac-specific thing even exists. A bit of Googling last night led me to a forum where I learned that Duplicate is the Mac version of Save As. More Googling will reveal the Mac equivalents of the keyboard shortcuts I have become so accustomed to in Windows programming.

Relearning is painful in one's mid-60s, but unfortunately necessary. Not to speak of good practice.