Apply macro to multiple sheets.

I have a simple macro that I would like to run through all sheets of my workbook without having to run each sheet individually. I have tried some other macros that supposedly do this, but I can't seem to get them to work with my code. I'm a beginner, so my knowledge is limited. The macro is designed to change lowercase text to uppercase.

Sub Uppercase()
' Loop to cycle through each cell in the specified range.
For Each x In Range("A1:A5")
' Change the text in the range to uppercase letters.
x.Value = UCase(x.value)
Next
End Sub

Also loop through each worksheet;

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Thank you so much! I would really like to take some classes to learn how to write this stuff.