The most important thing is that your formulas are correct and everything works. Colours are just used to highlight things and emphasise certain elements, like headings and totals. So they do not need to be used much. It is not a piece of art and Excel is not a graphics package. Too many colours can make it look gaudy. It can be very distracting. There is no use in having a very colourful workbook, if your formulas don't work. You will not get any plaudits for it. So you need to concentrate on getting your figures correct so that people that are using it can rely on the figures. That is what Excel is for.
Because it gives much more room for people to create much larger spreadsheets that would take too much paper. That is one of the major advantages of an electronic spreadsheet. You can manipulate much larger amounts of data on an electronic spreadsheet. This makes them far more useful. There is so much that can be done on a large electronic spreadsheet that would be very difficult to do on a paper-based one.
Yes, it does hurt.
It hurts alot but try not to think about it it won't hurt if you don't get scared too much
can water hutr you?
no
Too much chewing gum, too much oral sex or being punched.
You might do too much exercise.
Watching it too much can hurt your Eyes.
yes
your stomach will hurt
A spreadsheet is the main application for doing that, so that is the answer. Databases can do some too and also accountancy packages.
Washing too much or too vigorously can make your head sore and uncomfortable, yes.