Hello!

For the 3 symbols:

$ - you use this so that the ranges or cells within a formula don't change when you copy-paste or drag formulas across the spreadsheet.

& - You can use this to combine 2 cells together or concatenate them

! - Usually used as a separator or when you want to identify that the source of certain values are from different sheets of the same excel file.



For more tips on excel and Financial models, you can check this out. Hope this helps!