Premise:
"it's okay you can get started there"
Hypothesis: You can get started on the website and then start working on your own

it is not possible to tell

Premise:
"But one would be wrong."
Hypothesis: One is wrong because only one can be right.

it is not possible to tell

Premise:
"Each dive center is registered by the Greek government, and qualified to offer training for novice divers and supervision for qualified divers."
Hypothesis: Every dive center has to register with the Greek government and is certified to give training.
yes