What are principles of good testing scripts for automation?

1. Proper code guiding standards 
2. Std format for defining functions, exception handler etc 
3. Comments for functions 
4. Proper errorhandling mechanisms 
5. The apprpriate synchronisation techniques

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Proper code guiding standards

Best practice for writing code : use the key word Dim before declare any variable.
using optional explicit ( if we declare any variable before start coding it does not show any errors.).
commenting the code also good practice.
Make the script as reusable.(By writing functions)
follow the debugging technique.
using Exceptional handling to handle errors in the code.
At the end of the clean up the memory.