What simple & cheap technique should be used to protect visitors' privacy ? SSH ?

I want to protect visitors' privacy when they submit personal information to my site. Now I have no server yet. I am considering what technique to use to protect their privacy.

Some web hosting companies provide SSH access. I searched SSH on the net. I still not clear about what it is.What is it ? Is it easy to use? How to use it?

I heard of SSL more than SSH. What is the different between them?
Do I really need them? Which is more suitable for my need?

 

 

 

 

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