Websites, some websites, are setup to be like an info_commerical. I scanned their source code it is hard to deterime their creditability. To many Java scripts and redirects to make me comfortable.
As far as eMail I never worry about getting on a spam list because I use eMail addresses that are much like a throw away razor. I use it then toss it when it becomes cluttered. So much can be done to protect yourself from spam, and for me it is definately the throw away addresses. If it proves to be someone I find good I give them a better address. This way my main box stays clean. At one time I used to get thousands a day, and now just over 100..
As for lessons there are so many really good sources it is not worth chasing one that is not creditable. There are thousands of instructors but only a small handful that deliver.
... here is where I go to get domain names, hosting, and eMail boxes. They are a Wild West (GoDaddy) reseller. I am not really sold on using GoDaddy, but for domain names they are hard to beat. Hosting service? They overload the servers.. Email a plus.
Check out www.411w3.com
if interested. (Money goes to our Veterans)
For Internet lessons "Shawn Clement" is hard to beat.. I have him on my wesite, not that I get paid from him (because I don't) I have him on my site because he is good, very good.
Best of Luck and I hope my comments help.