diff --git a/Notes.md b/Notes.md
index 46c0701..59ad2ac 100644
--- a/Notes.md
+++ b/Notes.md
@@ -7,18 +7,71 @@
 ```ps
 $x="Text"
 ```
+
+#### Invoking / Data types
+
+##### String
+```ps
+[string]$x="Text"
+```
+
+##### Int
+```ps
+PS C:\Windows\system32> [int]$x=1
+PS C:\Windows\system32> [int]$x="1"
+PS C:\Windows\system32> [int]$x="1a"
+Cannot convert value "1a" to type "System.Int32". Error: "Input string was not in a correct format."
+At line:1 char:1
++ [int]$x="1a"
++ ~~~~~~~~~~~~
+    + CategoryInfo          : MetadataError: (:) [], ArgumentTransformationMetadataException
+    + FullyQualifiedErrorId : RuntimeException
+```
+
+##### Bool
+
+(MS Documentation)[https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_booleans?view=powershell-7.2]
+
 ### Array
 
 ```ps
 $arry = @("a", "b", "c")
 ```
 
-### Hash Array
+### Hash Table / Dictionary
 
 [MS documentation](https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_hash_tables?view=powershell-7.2)
 
+```ps
+[ordered]@{ <name> = <value>; [<name> = <value> ] ...}
 ```
-$X=@{ <name> = <value>; [<name> = <value> ] ...}
+
+(By default sorts by values, I believe ordered means the array trust you as the elements are ordered.)
+
+```ps
+$X = [ordered]@{A=1;C=2;B=3}
+```
+
+
+### Call a single elemnt from the array
+
+#### *Normal* Array
+
+```ps
+@("a", "b", "c")[0]
+>> a
+```
+
+```ps
+@("a", "b", "c")[-1 ]
+>> c
+```
+
+#### Hash array
+
+```ps
+@{A=1;C=3;B=2}["A"]
+>> 1
 ```
 
 ## User Interaction
@@ -55,12 +108,13 @@ Write-Output "text"
 ```ps
 Write-Output "text" | Select-String -pattern $filters -notMatch
 ```
+
 ## File interactions
 
 ### Read file
 
 ```ps
-Get-Contents $path
+Get-Content $path
 ```
 
 ### write to file
@@ -69,7 +123,6 @@ Get-Contents $path
 Write-Host $text | Out-File $path
 ```
 
-
 ## Operators
 
 ### Check if last command executed correctly
@@ -79,13 +132,14 @@ Write-Host $text | Out-File $path
 echo $?
 ```
 
-
 ### Looping
 
 #### For
 
 #### For each
 
+(MS Documentation)[https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/foreach-object?view=powershell-7.2]
+
 ## Management
 ### Access remote PS server
 ```ps
@@ -99,6 +153,21 @@ Enter-PSSession –ComputerName $hostname [-Credential username]
 Invoke-Command -ComputerName hostname1, hostname2 -ScroptBlock {$COMMAND}
 ```
 
+## Text formatting
+
+### ?
+https://devblogs.microsoft.com/scripting/understanding-powershell-and-basic-string-formatting/
+
+## Objects
+
+### Functions
+
+### Classes
+
+https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_classes?view=powershell-7.2
+
+[//]: # (https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_parameters?view=powershell-7.2)
+
 
 # Hypver-V specific 
 
diff --git a/Testing/hyperv_list b/Testing/hyperv_list
new file mode 100644
index 0000000..2f8036f
--- /dev/null
+++ b/Testing/hyperv_list
@@ -0,0 +1,2 @@
+host1
+host2 host3
\ No newline at end of file
diff --git a/Testing/simple_for.ps1 b/Testing/simple_for.ps1
index 8b54423..d92652e 100644
--- a/Testing/simple_for.ps1
+++ b/Testing/simple_for.ps1
@@ -1 +1,72 @@
-## For example
\ No newline at end of file
+# Author: Oriol Filter
+# Date: 04/04/2022
+
+
+
+$SCRIPT_PATH=$PSScriptRoot
+
+## Objects
+
+class VirtualizationServer {
+    [string]$URL
+    [bool]$Authenticated=$false
+}
+
+class HypervServer: VirtualizationServer{}
+class VMWareServer: VirtualizationServer{}
+
+
+# Get hyperv's
+filter Get-Hyperv
+{
+
+    $HYPERV_FILE = "$SCRIPT_PATH/hyperv_list"
+
+    ## In a future use a yaml as a .conf (with the hyperv and vmware listed)
+    #$__HYPERV_FILE = Get-Content "$_SCRIPT_PATH"
+    $HYPERV_FILE = "host1
+host2 host3"
+
+
+    $HYPERV_LIST = $HYPERV_FILE.Split()
+
+
+    $HYPERV_ARRAY=@()
+#    $i=0
+    foreach ($url in $HYPERV_LIST)
+    {
+        if ($url)
+        {
+            [HypervServer]$new_hyerv=[HypervServer]::new()
+            $new_hyerv.URL=$url
+            $HYPERV_ARRAY+=$new_hyerv
+#            $i++
+        }
+    }
+    return $HYPERV_ARRAY
+}
+
+function Check-Hyperv-Servers($hv_arr) {
+    foreach ($connection in $hv_arr)
+    {
+        $connection.cla
+    }
+}
+
+function Print-Connections-Status($vs_arr) {
+    foreach ($connection in $vs_arr)
+    {
+        $connection
+    }
+}
+
+$hyperv_arr=Get-Hyperv
+#$hyperv_arr.GetType()
+
+Print-Connections-Status($hyperv_arr)
+#echo "1"
+
+
+
+# Advanced params?
+# https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_functions_advanced_parameters?view=powershell-7.2
\ No newline at end of file