EXPERT RESPONSE
There are many Web pages that provide VPN tutorials. It really depends on what you are looking for. For a high level understanding about VPNs and their applications a simple Google search (VPN tutorial or VPN introduction) will give you good results. I would also narrow my search for VPN info by being specific on the technology: IPsec or L2TP VPNs, MPLS and IP VPNs, SSL based VPNs, etc.
If you want a detailed tutorial with specific protocol understanding then something that I refer to a lot is VPN Consortium's web page. Here is a link to the white paper section of their web page: http://www.vpnc.org/white-papers.html
SearchNetworking.com houses many documents addressing basic VPN information. The links are as follows:
VPN FAQs
Tips and guides
Best Web Links
White papers
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