Free Subscription Details

using the the free plan does it mean that every
month I get 100 submission or after 100 submissions that's it?.
What is 100 SSL and what is ssl?

I suggest checking for more details on the JotForm Pricing page as well.

If you exceed the regular 100 submission limits within a month, the forms will be temporarily disabled. So it will not be able to send submissions.

To reactivate the forms within the month, the next option is to upgrade the subscription to the higher paid plan. Paid subscription have greater submission limits that also reset every month

You can read more about SSL submission here

 http://www.jotform.com/help/63-How-can-I-receive-SSL-Submissions

Take note that only 10 SSL is allowed per month for FREE subscription.