Expanded and structurized scripts.

2 - Simple Automation/deleteOlderThan30Days/deleteOlderThan30Days.ps1

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+# Deletes all objects older than 30 days inside the folder. 
+# -WhatIf Parameter was chosen for Remove-Item to remove the necessity for file -recreation
+# Should creation of an file older than 30 days for testing purposes be necessary, run this script:
+
+# $file = "./testing.txt"
+# New-Item -Path $file -ItemType File -Force
+# $oldDate = (Get-Date).AddDays(-31)
+# (Get-Item $file).LastWriteTime = $oldDate
+# (Get-Item $file).LastAccessTime = $oldDate
+
+Get-ChildItem ".\" -Recurse | 
+Where-Object {$_.LastWriteTime -lt (Get-Date).AddDays(-30)} |
+Remove-Item -Force -WhatIf
+

2 - Simple Automation/exportFolderFileListToCSV/exportFolderFileListToCSV.ps1

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+# Export all file and folder path to folderFileList.csv
+# Select-Object FullName property was chosen to only export the full path.
+Get-ChildItem -Path "./" -Recurse | 
+Select-Object -Property FullName  | 
+Export-Csv -Path "./folderFileList.csv" -NoTypeInformation

2 - Simple Automation/fileFolderSorting/fileFolderSorting.ps1

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+# Assign all relevant file-extensions to arrays to easily filter through them during a for-loop
+# This approach was choosen for its simplicity and visibility
+
+[String[]]$videoFormat = "mp4", "mkv", "mov", "avi", "wmv", "flv", "webm", "mpeg", "mpg", "m4v", "3gp", "ogv", "ts", "vob"
+[String[]]$pictureFormat = "jpg", "jpeg", "png", "gif", "bmp", "tiff", "tif", "webp", "heic", "heif", "raw", "cr2", "nef", "arw", "svg", "ico"
+[String[]]$documentFormat = "pdf", "doc", "docx", "odt", "rtf", "txt", "csv", "xls", "xlsx", "ods", "ppt", "pptx", "odp", "md", "html", "xml"
+
+$filesInFolder = Get-ChildItem -Path "./" -File
+
+foreach($file in $filesInFolder){
+    $extension = $file.Extension.TrimStart('.').ToLower()
+
+    if ($videoFormat -contains $extension){
+        Move-Item -Path $file.FullName -Destination "./videos/$($file.Name)"
+    }
+
+    elseif ($pictureFormat -contains $extension) {
+        Move-Item -Path $file.FullName -Destination "./pictures/$($file.Name)"
+    }
+
+    elseif ($documentFormat -contains $extension) {
+        Move-Item -Path $file.FullName -Destination "./documents/$($file.Name)"
+    }
+    
+}

2 - Simple Automation/findAndReplaceTextMultipleFiles/findAndReplaceTextMultipleFiles.ps1

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+# File searches for txt files and replaces specified string.
+
+$textFiles = Get-ChildItem -Path "./" -Filter *.txt
+$searchText = 'this text is false'
+$replaceText = 'this text is true'
+foreach($textFile in $textFiles){
+    (Get-Content $textFile) -replace $searchText, $replaceText | Set-Content $textFile
+}

2 - Simple Automation/findAndReplaceTextMultipleFiles/sample.txt

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+this text is false
+

2 - Simple Automation/findAndReplaceTextMultipleFiles/text1.txt

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+this text is false
+

2 - Simple Automation/folderBackup/folderBackup.ps1

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+# Copy 'important' folder to 'safe' location
+# Get-ChildItem -Filter parameter was deemed insufficient and replaced by -Directory | Where-Object
+# As the -Filter parameter only matches folders at current level, not recursively in all subfolders.
+
+$nameOfFolder = "important"
+$directionOfFolder = Get-ChildItem -Path "./" -Recurse -Directory | Where-Object { $_.Name -eq $nameOfFolder }
+Copy-Item -Path $directionOfFolder.FullName -Destination (Join-Path "./safe/" $directionOfFolder.Name) -Recurse -Force 

2 - Simple Automation/folderBackup/unsafe/important/important.txt

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+important