We want to make a change:
Record One Unit of Work
normalizes our cursor position by placing it at the start of the line. This means that our next motion always starts from the same place, making it more repeatable.
Note: f. is more repeatability than l
Execute Macro in Series
When the f. command is executed, it finds no . characters and the macro aborts.
Execute Macro in Parallel
tells Vim to execute the macro once for each line in the selection.
Deciding: Series or Parallel Executing a macro on multiple items in parallel is more robust.