Can you tell me what each of these are, as in there purpose and what fluid they use and if they are low, can they just be filled, or is there a process needed to go through.

Thanks

1974 datsun 260z

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The two together are your brake fluid flasks, the single is the clutch slave cyl flask. All three get break fluid, and will need to be bled to clear any bubbles if they are empty. Search "brake bleeding" in the archives for instructions.

Will

Aren't they the matter and anti matter converters????

Get yourself a workshop manual and have a good read.

And don't leave 'em sitting open with fluid, as I recall being told brake fluid sucks moisture out of the air, and you don't want water in your lines.

That is correct. Brake fluid for some reason attracts moisture. Make sure they have a good seal on the caps. In a car this old, you will most likely have to bleed all the lines through to get rid of the old stuff and air. Dot 3 brake fluid is all you need. Do not use Dot 5, it'll mess up your car bigtime.