SharePoint Online: How to Change Home Page using PowerShell?

Requirement: SharePoint Online Set Home Page

How to Change Home page in SharePoint Online?
The welcome page or Home page is the initial page displayed when you browse to a site. By default Home.aspx page in the Site Pages library is defined as the site welcome page. You can create a new page and set it as the site's welcome page. To set the home page in SharePoint Online:

• Navigate to Site Settings >> Click on "Welcome Page" link under "Look and Feel" group
  
• This takes you to the "Site Welcome Page" (/_layouts/15/AreaWelcomePage.aspx) where you can pick any existing page and set it as a welcome page or home page for your SharePoint Online site.
  

This changes the welcome page in SharePoint Online.

SharePoint Online: Set Modern Page as Homepage
In modern sites, You can change the site home page by navigating to:

• Click on "Site Settings" gear >> Site Contents
• Click on "Site Pages" Library >> Right-click on the target Home page, and select "Make Home Page" from the context menu.
  

SharePoint Online: Change home page using PowerShell
Here is the PowerShell to set the page as a homepage in SharePoint Online.

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

#Set Parameter Values
$SiteURL="https://crescent.sharepoint.com"
#Relative url of the homepage
$HomePageURL="SitePages/default.aspx"

#Setup Credentials to connect
$Cred = Get-Credential
$Cred = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.UserName,$Cred.Password)
#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Ctx.Credentials = $Cred

#sharepoint online powershell set home page
$Ctx.web.RootFolder.WelcomePage = $HomePageURL
$Ctx.web.RootFolder.Update()
$Ctx.ExecuteQuery()

This PowerShell CSOM script sets the home page in SharePoint Online.

PnP PowerShell to Make Document Library as home page in SharePoint Online
This time lets set a document library as home page for a SharePoint Online site using PnP PowerShell

#Config Variables
$SiteURL = "https://crescenttech.sharepoint.com/Sales"
#Page Relative URL to the Web
$HomePageURL = "Shared Documents/Forms/AllItems.aspx"

#Get Credentials to connect
$Cred = Get-Credential
 
#Connect to PNP Online
Connect-PnPOnline -Url $SiteURL -Credentials $Cred

#Set Home page
Set-PnPHomePage -RootFolderRelativeUrl $HomePageURL 

Similarly, You can set a List page as Home page by setting the $HomePageURL parameter to: $HomePageURL = "Lists/PortfolioTracker/AllItems.aspx"

Set-PnPHomePage -RootFolderRelativeUrl Shared%20Documents/Forms/AllItems.aspx