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docs/document/Articles/docs/What to Know when Learning a New Language.md

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+# What to Know when Learning a New Language
+
+## File Types and Configuration Files
+
+A language might use different extensions to identify the usage of the source.
+For example, powershell uses `.ps1` to identify a script and `.psm1` to identify a module file.

docs/document/Powershell/docs/1.Overview.md

@@ -1,15 +1,12 @@
 # Overview
 
 - Integrated with `.NET`
-Reuse almost any type in `.NET`.
+    - Reuse almost any type in `.NET`.
 - Dynamic typing
-Powershell adds extra attribute and properties on dotnet types to enhance experience.
+    - Powershell adds extra attribute and properties on dotnet types to enhance experience.
 - Case insensitive
-All language syntax, pattern syntax and even strings are case-insensitive.
-(There's exception for file system on non-Windows platform)
+    - All language syntax, pattern syntax and even strings are case-insensitive. (There's exception for file system on non-Windows platform)
 - Everything is object, more than plain text in shell.
-Powershell formats the object value as a table if the object is not a primitive type.
-For primitive type, `Tostring()` will be used instead.
+    - Powershell formats the object value as a table if the object is not a primitive type. For primitive types, `Tostring()` will be used instead.
 - Always handle both array and singular object.
-A powershell cmdlet always accepts an array or an single object as input parameter.
-And returns the result as an array or an object too.
+    - A powershell cmdlet always accepts an array or an single object as input parameter. And returns the result as an array or an object too.