diff --git a/docs/document/Bash/docs/Bash as A Language/String.md b/docs/document/Bash/docs/Bash as A Language/String.md
index 1610c6b1..802bc878 100644
--- a/docs/document/Bash/docs/Bash as A Language/String.md	
+++ b/docs/document/Bash/docs/Bash as A Language/String.md	
@@ -1,6 +1,6 @@
 # String
 
-# Native String
+## Native String
 
 Strings in bash can be native without any quote.
 
diff --git a/docs/document/Powershell/docs/Overview.md b/docs/document/Powershell/docs/1.Overview.md
similarity index 100%
rename from docs/document/Powershell/docs/Overview.md
rename to docs/document/Powershell/docs/1.Overview.md
diff --git a/docs/document/Powershell/docs/Alias.md b/docs/document/Powershell/docs/Alias.md
index a7ebaa89..ea817b3c 100644
--- a/docs/document/Powershell/docs/Alias.md
+++ b/docs/document/Powershell/docs/Alias.md
@@ -58,3 +58,6 @@ alias gl='git log' # fine
 New-Alias gl 'git log' # not allowed! # [!code error] 
 ```
 
+> [!TIP]
+> Use functions to do alias with predetermined parameters in your profile.
+
diff --git a/docs/document/Powershell/docs/File System/1.Overview.md b/docs/document/Powershell/docs/File System/1.Overview.md
new file mode 100644
index 00000000..1b7605c1
--- /dev/null
+++ b/docs/document/Powershell/docs/File System/1.Overview.md	
@@ -0,0 +1,9 @@
+# Overview
+
+**FileSystem** is a builtin **PSProvider** in Powershell.
+
+FileSystem can have one or more **PSDrive** depends on the system.
+
+In windows, drives can be `C:`, `D:` and so on. In linux they can be some mount points.
+
+This is introduces how to manipulate file system objects with item-related cmdlet.
diff --git a/docs/document/Powershell/docs/File System/2.Working Directory.md b/docs/document/Powershell/docs/File System/2.Working Directory.md
new file mode 100644
index 00000000..b5c9731b
--- /dev/null
+++ b/docs/document/Powershell/docs/File System/2.Working Directory.md	
@@ -0,0 +1,39 @@
+# Working Directory
+
+## Change Directory
+
+```ps1
+Set-Location <path>
+```
+
+Powershell has three builtin aliases for `Set-Location`
+
+```console
+$ Get-Alias -Definition 'Set-Location'
+
+CommandType     Name                                               Version    Source
+-----------     ----                                               -------    ------
+Alias           cd -> Set-Location
+Alias           chdir -> Set-Location
+Alias           sl -> Set-Location
+```
+
+## Current Working Directory
+
+There's two ways to get current working directory in Powershell.
+
+- `$PWD` builtin string variable. Refreshes on each time location changed.
+- `Get-Location` cmdlet. Returns a `PathInfo` object.
+  - `pwd` is an builtin alias for `Get-Location`.
+
+```ps1
+(Get-Location).Path # equivelant to $pwd
+```
+
+```console
+$ Get-Location | select -Property *
+
+Drive Provider                             ProviderPath       Path
+----- --------                             ------------       ----
+D     Microsoft.PowerShell.Core\FileSystem 
+```
diff --git a/docs/document/Powershell/docs/File System/3.Create Item.md b/docs/document/Powershell/docs/File System/3.Create Item.md
new file mode 100644
index 00000000..4ba5b5d4
--- /dev/null
+++ b/docs/document/Powershell/docs/File System/3.Create Item.md	
@@ -0,0 +1,59 @@
+# Create Item
+
+Powershell uses a single cmdlet named `New-Item` to represent all kinds of creation logic for file system items like folder, file, symlinks...
+
+> [!TIP]
+> Use `ni` alias for `New-Item`.
+
+## File
+
+`New-Item` creates file without extra options by default.
+
+```ps1
+New-Item -Path <file_path>
+# or
+New-Item <file_path>
+```
+
+> [!NOTE]
+> `-Path` is the first positional parameter which can be ignored.
+
+> [!NOTE]
+> `-Path` is `string[]`, so you can create multiple items at a same time with same options.
+
+> [!TIP]
+> Use `-Force` flag to overwrite existing target.
+
+## Directory
+
+```ps1
+New-Item <dir_path> -ItemType Directory
+```
+Powershell has another builtin function called `mkdir`, it's a shorthand for `New-Item <dir_path> -ItemType Directory`
+
+```ps1
+mkdir <dir_path>
+```
+
+> [!NOTE]
+> When creating directory, `New-Item` ensures necessary parent directories by default, so there's no things like `mkdir -p`.
+
+> [!TIP]
+> Use `-Force` flag to overwrite existing target.
+
+## Symbolic Link
+
+```ps1
+New-Item <symlink_path> -Target <source> -ItemType SymbolicLink
+```
+
+> [!TIP]
+> Use `-Force` flag to overwrite existing target.
+
+## Ignore Wildcards
+
+`-Path` translates wildcards by default, if you do need to include special characters from wildcards syntax for your new item, use `-LiteralPath`.
+
+```ps1
+New-Item -LiteralPath 'foo*.txt' # creates a file literally named `foo*.txt`
+```
diff --git a/docs/document/Powershell/docs/PSDrive.md b/docs/document/Powershell/docs/PSDrive.md
new file mode 100644
index 00000000..59c2bb5d
--- /dev/null
+++ b/docs/document/Powershell/docs/PSDrive.md
@@ -0,0 +1,30 @@
+# PSProvider
+
+**PSProvider** is another confusing concept from powershell.
+A PSProvider basically provides a way to browse and access items from a source.
+There's some builtin PSProviders like `FileSystem`, `Registry` on windows and so on.
+
+You can check all available providers by:
+
+```console
+$ Get-PSProvider
+
+Name                 Capabilities                                                          Drives
+----                 ------------                                                          ------
+Registry             ShouldProcess                                                         {HKLM, HKCU}
+Alias                ShouldProcess                                                         {Alias}
+Environment          ShouldProcess                                                         {Env}
+FileSystem           Filter, ShouldProcess, Credentials                                    {C, D, Temp}
+Function             ShouldProcess                                                         {Function}
+Variable             ShouldProcess                                                         {Variable}
+Certificate          ShouldProcess                                                         {Cert}
+WSMan                Credentials                                                           {WSMan}
+```
+
+## PSDrive
+
+Each PSProvider can have one or more **PSDrive**.
+
+PSDrive is kind of like one of the entries of a PSProvider.
+
+Check all available PSDrive by `Get-PSDrive`.