I updated the post.
1. If you use Sitefinity 3.7 SP4. the nodes count is shown right above the Grid used in Pages
You can programmatically get the count of all pages ( nodes) by using CmsManager.GetPages() and then cal Count to the list that is returned by GetPages();
2. For content items, you can do this programmatically
ContentManager.GetContent().Count. You need to do this for each provide you have.
Let me know if you need further assistance.
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