SharePoint Online Customized Dashboards

Hi Deleted,

The best options are to create a search web part that displays the list of subsites.

This might not be too easy though if you are completely new to SharePoint.

The short steps are:

1. create a new page

2. Add a search web part

3. Configure a query to just show sub sites.

4. Add a search box web part

5. Add a refiner web part. 

Then you might want to create some custom display templates if you want to control how the sites are displayed.