Expanded and structurized scripts.

1 - Basics/to-do-text-file-through-script/to-do-text-file-through-script.ps1

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+# Prompt the user and add their input to the textfile.txt
+# Adding instead of setting so previous items are not lost
+
+$text = Read-Host "What item to you want to add to your to-do list? "
+$text | add-Content $PSScriptRoot\textfile.txt

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

3 - Intermediate/checkRunningProcessAndAlertIfIsNotRunning/checkRunningProcessAndAlertIfIsNotRunning.ps1

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+# Opens notepad process/program if it is not in the running Process list. 
+# processName variable for easy exchange of process
+# Forms Messagebox instead of Write-Host for more urgency
+
+$processName = "notepad"
+
+while ($true){
+    if (-not (Get-Process -name $processName -ErrorAction SilentlyContinue)){
+        [System.Windows.Forms.MessageBox]::Show("$processName is not running! It will now be opened.", "Alert", 
+        [System.Windows.Forms.MessageBoxButtons]::Ok,
+        [System.Windows.Forms.MessageBoxIcon]::Warning)
+        Start-Process $processName
+    }
+}

3 - Intermediate/downloadFilesFromURL/downloadFilesFromURL.ps1

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+# Creates downloads Folder and uses the Invoke-WebRequest function to acquire and download file to said folder.
+# System.IO.Path is called to extract Filename from URL. 
+# Microsoft.VisualBasic.Interaction is called to provide simple input dialog.
+
+$downloadFolder = "$($PSScriptRoot)/downloads"
+
+if (-not (Test-Path $downloadFolder)){
+    New-Item -Path $downloadFolder -ItemType Directory
+}
+
+Add-Type -AssemblyName Microsoft.VisualBasic
+$userInput = [Microsoft.VisualBasic.Interaction]::InputBox("Enter URL: ", "downloadFilesFromURL", "")
+# [System.Windows.Forms.MessageBox]::Show("Your entered URL is '$userInput'.", "Alert",
+# [System.Windows.Forms.MessageBoxButtons]::Ok,
+# [System.Windows.Forms.MessageBoxIcon]::Information)
+
+if (-not $userInput -or -not ($userInput -match "^https?://")){
+    [System.Windows.Forms.MessageBox]::Show("Incorrect URL : $userInput", "Alert",
+    [System.Windows.Forms.MessageBoxButtons]::Ok,
+    [System.Windows.Forms.MessageBoxIcon]::Error)
+    return
+}
+
+$fileName = [System.IO.Path]::GetFileName($userInput)
+$downloadFolderPath = Join-Path $downloadFolder $fileName
+Invoke-WebRequest -Uri $userInput -OutFile $downloadFolderPath -ErrorAction Stop

3 - Intermediate/generateReportOfInstalledPrograms/generateReportOfInstalledPrograms.ps1

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+# Exports CSV file containing all installed programms
+
+# Test-Path added to avoid Remove-Item error on first execution.
+# Remove-Item was added to avoid complications with Export-Csv function.
+# Delimiter was added to not have all properties stacked in the same column.
+if (Test-Path "./InstalledPrograms.csv"){
+Remove-Item -Path "./InstalledPrograms.csv"
+}
+Get-Package | Select-Object -Property Name, Version, Summary |
+Export-Csv -Path "./InstalledPrograms.csv" -NoTypeInformation -Delimiter ";"

3 - Intermediate/monitorFolderAndLogChanges/monitorFolderAndLogChanges.ps1

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+# File creates listeners for happenings folder
+# Listens for file creation, deletion, renaming
+# Exports events to log.txt
+
+# $fsw to save typing for three listeners. 
+# Property @{IncludeSubdirectories = $true} to trigger listeners in subdirectories too.
+# EnableRaisingEvents = $true explicitely enabled for completeness sake, by default powershell implicitely turns it on.
+$fsw = New-Object IO.FileSystemWatcher "$($PSScriptRoot)/happenings/" -Property @{
+    IncludeSubdirectories = $true
+    EnableRaisingEvents = $true}
+
+Register-ObjectEvent $fsw Created -SourceIdentifier "fileFolderCreated" -Action {
+    $name = $Event.SourceEventArgs.Name
+    $fullPath = $Event.SourceEventArgs.FullPath
+
+    Add-Content "./log.txt" -value "[FILE CREATION]: DATE: $(Get-Date), NAME: $name, PATH: $fullPath"
+}
+
+Register-ObjectEvent $fsw Deleted -SourceIdentifier "fileFolderDeleted" -Action {
+    $name = $Event.SourceEventArgs.Name
+    $fullPath = $Event.SourceEventArgs.FullPath
+
+    Add-Content "./log.txt" -value "[FILE DELETION]: DATE: $(Get-Date), NAME: $name, PATH: $fullPath"
+}
+
+Register-ObjectEvent $fsw Renamed -SourceIdentifier "fileFolderRenamed" -Action {
+    $oldName = $Event.SourceEventArgs.OldName
+    $oldFullPath = $Event.SourceEventArgs.OldFullPath
+    $name = $Event.SourceEventArgs.Name
+    $fullPath = $Event.SourceEventArgs.FullPath
+
+    Add-Content "./log.txt" -value "[FILE RENAMING]: DATE: $(Get-Date), OLDNAME: $oldName, OLDPATH: $oldFullPath, NEWNAME: $name, NEWPATH: $fullPath"
+}
+
+# See active listeners
+# Get-EventSubscriber -Force | Format-Table -AutoSize
+
+# Remove all active listeners
+# Get-EventSubscriber -Force | Unregister-Event -Force