Why is it important to learn and harness the skill of using Spreadsheets? Simple. It makes your life a whole lot easier!
If you are able to create spreadsheet formulas say to add/multiply a long list of numbers in an instance, then you can be more productive in doing something else with your time.
It isn’t that hard to learn using spreadsheet applications. One just need perseverance to teach oneself and not rely on giving the task to others.
Google Sheet Tutorial 