How to choose a mask and fins for snorkeling and diving

If the holidays by the sea are approaching, if you already imagine yourself lying on the beach but, above all, in the water discovering suggestive seabeds, among fish, molluscs and marine vegetation, what you need is, of course, adequate "equipment. Mask, snorkel, fins can not be missing if you want to dedicate part of your holiday to snorkeling and diving more or less demanding.