To get a list of all subsites in a site you can run the following pattern:

using (SPSite site = new SPSite(“[YOUR SITE COLLECTION URL]“))
{
    using (SPWeb web = site.RootWeb)
    {
        foreach (SPWeb subWeb in web.Webs)
        {
            // Do your thing…
        }
    }
}

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Posted under Developer

To add a web part to a SharePoint page using the web interface you need permissions to do so. If you have those permissions you will have a Site settings->Edit page option

Posted under Administration, End user

To find the strong name of an assembly you have several options. If the assembly has been deployed to the global assembly cache, or GAC, you can open the assembly in the GAC (c:\Windows\Assembly) and view its properties.

Posted under Developer

To add a feature with a feature receiver event handler your feature.xml file needs to have ReceiverAssembly and ReceiverClass added to the Feature element

Posted under Developer