Professional or expert is a state of being and doing.  It needs qualification.  If we use a scale of 0 to 100 as a measurement, being professional or expert of a certain field requires to have 80 or above.  That is they have a high standard of performance in whatever fields they are in.

It is not merely a degree or a title or even just throwing in the words “professional“, “expert” can cut it.  Being professional means having a professional mindset and attitude.  Doing professionally means performing the tasks of whatever fields with higher quality and accuracy.

For example, everyone can be a plumber, but not everyone can effectively or accurately find out where or what caused the leak inside a wall is.  Everyone can do what electricians does, but that does not mean everyone can avoid being electrocuted.  High standard in athleticism makes ppl professional in sports.

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