If you're using Excel to calculate monetary values, then you only have to worry about two decimal places in your numbers. Aligning your numbers to the right automatically lines up the decimal points ...

If you want to add decimal points in Excel cells automatically, here is how you can do that. Although you can use the in-built options to enable this setting, you can also use the Registry Editor and ...

These are decimal numbers, and dots above some of the digits make them recurring decimals. One dot means the digit under it repeats infinitely. In other words, it goes on forever (and ever and ever).