function Get-SPOWebs(){

param(

   $Url = $(throw "Please provide a Site Collection Url"),

   $Credential = $(throw "Please provide a Credentials")

)

  $context = New-Object Microsoft.SharePoint.Client.ClientContext($Url)  

  $context.Credentials = $Credential 

  $web = $context.Web

  $context.Load($web)

  $context.Load($web.Webs)

  $context.ExecuteQuery()

  foreach($web in $web.Webs)

  {

       Get-SPOWebs -Url $web.Url -Credential $Credential 

       $web

  }

}

 Created Add-in on SharePoint instance with following permission xml

<AppPermissionRequests>

        <AppPermissionRequest Scope="http://sharepoint/content/tenant" Right="FullControl"/>

        <AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="Read"/>

</AppPermissionRequests>

Used below API to get all sites and subsites

http://devprasad007-admin.sharepoint.com/_api/search/query?querytext='contentclass:STS_Site' &rowlimit=100

https://<site_name>.sharepoint.com/_api/search/query?querytext='contentclass:STS_Site 

Path:"https://<site_name>.sharepoint.com/*"'&rowlimit=500 

Break role inheritance for a List object and grant Full Control permissions for a current user

 var listTitle = 'Documents';

var spCtx = SP.ClientContext.get_current();

var list = spCtx.get_web().get_lists().getByTitle(listTitle);   

spCtx.load(list,'HasUniqueRoleAssignments'); 

spCtx.executeQueryAsync(

   function(){

      var hasUniqueAssgns = list.get_hasUniqueRoleAssignments();

      if(!hasUniqueAssgns) {

         list.breakRoleInheritance(false, true);

         spCtx.executeQueryAsync(

            function(){

                console.log('Success');

            }, 

            function(sender,args){

               console.log(args.get_message());    

            }

         );

      }

   }, 

   function(sender,args){

      console.log(args.get_message());    

   }

);

 SP Online site stored in Documents, When we trying to adding/retrieving documents but in the delete flow If you get an error during retrieval of a File object.

var relativeUrl = "/sites/documentsite/Documents/images.jpg";
we have to specific or construct the full URL.

 List docs = web.Lists.GetByTitle("DOCUMENTS");

Microsoft.SharePoint.Client.File uploadFile = docs.RootFolder.Files.Add(newFile);

clientContext.ExecuteQuery();

clientContext.Load(uploadFile.ListItemAllFields, item => item["EncodedAbsUrl"]);

clientContext.ExecuteQuery();

var fileUrl = uploadFile.ListItemAllFields["EncodedAbsUrl"].ToString();

string link = ctx.Web.CreateAnonymousLinkForDocument(fileUrl, ExternalSharingDocumentOption.View);

string linkwithExpiration = ctx.Web.CreateAnonymousLinkWithExpirationForDocument(fileUrl, ExternalSharingDocumentOption.Edit, DateTime.Now.AddMonths(1));

SharingResult result = ctx.Web.ShareDocument(fileUrl, "reven@peakfinders.com", ExternalSharingDocumentOption.View, true, "Documents shared Sucessfully");