how to get a list of all sharepoint sites that I am part of with their respective owners details

Hi @Solanki, Akshaykumar ,

OOTBly I'm afraid this is not possible to show the sites you are a member of and the site owners of those sites together. I would suggest you can search by "contentclass:STS_Site" and go to SharePoint admin center, then search sites under Sites >> Active sites. Click the site name and you can see site owners under Membership tab. Or you can fetch site owners using PowerShell:

#Variables for Admin Center & Site Collection URL 
$AdminCenterURL = "https://Contoso-admin.sharepoint.com" 
$SiteURL = "https://Contoso.sharepoint.com/sites/marketing"   

#Connect to SharePoint Online 
Connect-SPOService -url $AdminCenterURL -Credential (Get-Credential)  
 
#sharepoint online powershell get site owner 
Get-SPOSite $SiteURL | Select Owner  

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It can be done. Also include &selectProperties with Author. This should return the owners. We also include contentclass:STS_Web in the search request to return all subsites (example). There are lots of useful properties that can be returned via search (e.g., related bug site, views, external sharing, ...). It is worth investing time in the search query language and schema. It is very powerful.