A formula represents a method of calculation such as addition or subtraction. A function represents a more complicated math that is built in to the spreadsheet package. There will be some examples later. When you start the spreadsheet package, you will find a worksheet displayed and, at the top of the page, the menu bar. Two important function keys to know are F1 for help and F2 for edit.
All spreadsheets have menu selections.
As previously mentioned, you can only enter data, whether it is a label or a value, when the menu bar is activated. Remember that a value can be a number, a formula or a function. If the first character is anything other than what is listed above, the spreadsheet will decide you are typing in a label. If you type a label, the default alignment is left-justified. You can modify the alignment of a label to be centered or right-justified.