what is the best lure for catching salmon and snapper? AND WHAT SIZE OF HOOK IS THE BEST TO CATCH BIG MEAT FISH?
ALSO, IS THE TRIPLE HOOK MUCH BETTER THAN THE SINGLE HOOK?

Sounds like you are trying to get ahead of yourself Slow down, you only just started fishing

I assume you mean Australian Salmon?

Salmon are usually caught off beaches and rocky headlands. They will take shiny metal lures with a fast retrieve. They will take live baits under a float. They will take whole or cut pilchard. They will even take soft plastics that are allowed to ebb and flow in the current using a channel sinker. They will sometimes come into rivers and bays, but usually stay near open water.

Snapper are very much like bream. Snapper are often a by-catch when fishing for mullaway on beaches. They will take cut pilchard and soft plastics. But the all time favorite for snapper is baby octopus. But if you want to target snapper, you first need a boat. Sure, they can be caught land based and often are. With only a few days under your belt, I don't think you are ready to be targeting snapper...give it at least a week

Hook size ? There is an old saying a small hook will catch a big fish but a big hook will not catch a small fish. What I do, is match my bait (or lure) to the fish I am after and then match the hook to the bait. But that is me.

What do you mean by "triple hook". Do you mean a treble or do you mean a triple gang?

I mean treble hook.

Trebles are used on lures. Not counting some soft plastics, lures don't taste like food. So as soon as the fish takes the lure it will try to spit it out. A treble hook gives a much better chance of a hookup before the fish gets to spit it out.

Some soft plastic lures are scented and flavored so the fish will actually try to eat it. So a single hook is all that is needed.

Some areas do not allow the use of trebles (or gang hooks). If there are any local regulations your local tackle shop will be able to let you know.