can anyone tell me how to correctly use nutrients? I have a 1 liter of Monkey Juice nutrients, and at the first stage of giving my plants nutrients I'd like to give them a 600 ppm feeding. except I don't know what to add the nutrients to, or how much to add to what amount. I've very unclear, and extremely confused when it comes to the nutrients part.

Add it to the the water.

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exactly. if I was to add it to the water, to make 600 ppm. how much water would I use?

Ya need a ppm meter.
You are hydro or soil?

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I've heard this. that I need a ppm meter. aren't they very expensive? I've heard of them being a lot. I'm doing a soil grow, 3 gallon bags.

Ya dont need one. Read the directions on your nutes cotainer it will tell you how much to add per gallon of water.

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You also might want to start at 1/4 or 1/2 strength of the recommended dosage if this is the first time your nuting, and/or if they're still young.