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I have 8 bonsai trees all different species. I have a big problem with knats how do I get rid of them also there is white dust or water spots on the leaves what could that be.

Knats? Sorr my bad english skills, do you mean fungus gnats?

Little Flys (knats) are comming out of the soil and my soil is infested with them

Where are you located, country?
Put your tree's outside in summer, as then the fly's have a way to fly away and your not forcing them to stay indoor and lay there egg's on the soil in your house. For winter you can use sticky paper or some prediters nematodes, both buyable online or in gardencentra's.

I live in united States I don't want my bonsai outside because of the squirrels they will dig into my soil and tear my trees up also spotted lantern flies we have a problem with them around here .I started all of my bonsai from seed so I would be really upset if they got messed up also I would love to put them outside for the natural sunlight if you could give me some help with these problems it would be greatly appreciated thankyou

quirrels they will dig into my soil and tear my trees up also spotted lantern flies

From the knowlage that i read from your post. I see more problems with your tree's indoor, then you have problems outside to battle with.
So if you place your tree's outside inside a cage, with some anti insectal netting around it. You fixed those 2 problems.
All other problems that you encouter with your tree's indoor's will be gone then.

If you move them outside, make sure you harden them off, because there weak from being indoor.
Put them first two weeks in morning sun only, and them move them to there final spot.

I had the same problem. They are a fungus gnat. The adult only lives a couple weeks, but in that time it can produce 300 larvae in the soil of every plant you have in dirt. The only thing I have found that works, (believe me I’ve tried everything!) is Neem Oil spray. I sprayed the dirt every 7 days until the was no more sign of them. For me it took 3 times, 3 weeks. Also you have to spray all the plants in your home because they love to travel.