What is the difference between Hardwork and Smart Work?

What is the difference between Hardwork and Smart Work?
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Hard work is when you spend hours struggling to memorise some concepts and tire yourself. After a period of time, you may tend to forget it.

A clever way of remembering concepts is called Smart work. You can never forget the concepts learnt using memory techniques.

for example: Rivers in Punjab are Jhelum, Chenab, Ravi, Beas, Sutlej

An easier way to remember the rivers in Punjab is Jesus Christ Rise Before Sunrise (Jhelum, Chenab, Ravi, Beas, Sutlej)

It is always preferable to work smart and not hard.