Greetings:
Have for some time used the following in a number of applications
     Columns("F:G").Select
             Selection.EntireColumn.Hidden = True
Works Great:
Now I need to add column J, as well.
  After checking group sites, I tried:
          Columns("F:G,J").Select
          Columns("F:G,J:K").Select
          etc................. .
      F and G always hides fine
      J (and K) are to stubborn to disappear.

Then I read in one post to use "Select" as little as possible, so I changed to
     Range("F:G,J:K").EntireColumn.Hidden = True
           and variations thereof.
  Again, F and G disappear, J and K just keep hanging around.

Once again, I'm likely missing something obviouis, but I just can't find it.
Please help.

ALSO:  Why is it recommended to be good coding practice to use SELECT as
infrequently as possible?

Thanks