I learned various built in ROM Basic systems, which I really wouldn't count, since there were no disks to save programs to, etc.

I learned Turbo Pascal soon after it came out. I still program in Pascal to this day.

Things that have changed in the mean while:

  Windows became a thing, Delphi, Lazarus happened
  Networking, the interenet
  Strings can now store a gigabyte of text, not just 255 characters
  For X in Y is now a thing
  Generics
  Threading (though I did write my own for use with DOS back in 1987)