Understanding Excel VBA Geocoding

[jsaavoss]

I need to determine latitude and longitude coordinates corresponding to a list of addresses.

There are lots of tutorials that cover how to do this. This link provides code for a VBA function that will carry out this exact task.
http://www.myengineeringworld.net/2014/06/geocoding-using-vba-google-api.html

However, the code includes sections that I do not fully understand.

For example:

    'Create the request based on Google Geocoding API. Parameters (from Google page):
    '- Address: The address that you want to geocode.
    '- Sensor: Indicates whether your application used a sensor to determine the user's location.
    'This parameter is no longer required.
    Request.Open "GET", "http://maps.googleapis.com/maps/api/geocode/xml?" _
    & "&address=" & Address & "&sensor=false", False
            
    'Send the request to the Google server.
    Request.send
    
    'Read the results from the request.
    Results.LoadXML Request.responseText
    
    'Get the status node value.
    Set StatusNode = Results.SelectSingleNode("//status")

The comments make it clear what each line of code does, but I would like to have a deeper understanding of the syntax before proceeding. Can anyone point me to appropriate references?

Thank you.