I have found one of my raised Veggie gardens has a ton of these little tiny looking spiders. I've heard spider mites don't live in soil and can't usually be seen but I can see these crawling around everywhere. Separately also trying to get rid of gnats. Any idea what these are and if they're harmful? I have holes in leaves so assumed that they were spider mites. Have tried Neem oil spray and insecticidal soap spray, as well as yellow sticky tapes. I have videos where you can see them crawling around but harder to see in photos.

Spider mites are very tiny and they live primarily on the undersides of leaves. They are so small as to be unnoticed by most people. They make themselves noticed by the damage that they leaving behind. They are a sucking, not chewing insect. They often start to suck the life out of plant by sucking juices.
The gnats are most likely fungus gnats. Your little insects may be pseudoscorpions, that are drawn to all of your wood debris from mulch most likely.
A Neem Oil spray or insecticidal soap spray can be very effective treatments! Did you do follow up spraying?? Sometimes 3 treatments are needed, each a week to ten days apart.

Yikes! pseudoscorpions see what nightmares are made of!! Thanks for the reply! I did Neem oil a week ago or so, and again today. And did the insecticidal soap last night and then this morning in spots I didn't get. I'll wait a week and do it again. There's no way to share a video right? The pictures aren't clear but I have a video where you can see them all crawling around and it's much better!!

Okay! So I uploaded videos to YouTube do you can see. I can't share the links Bc I am a new user. But if you go to a browser and enter the link manually it should work. The site is YouTu.be (Their link shortener is that way, With the be after the period) and then slash, and the text below. You can see the little spider looking guys walking around. I think they've gotten better because I saw so many more before I did these treatments but I'll check again at night.

Video 1 - CL8LQVjAwAw
Video 2 - VtrFvw0WX8E

You should spray Neem after sunset or very early in the morning.

Neem Oil is spray today, spray again within a week to ten days and spray a third time a week to ten days after the second treatment!
The reason you spray a week to ten days apart is because a lot of insects have a very short lifespan. The first spray kills the adults and juveniles. The second spray typically kills the insects from eggs that have hatched since spray #1. A third spray is often called the Good Measure Spray. I sprayed them again just for good measure.
AND MOST IMPORTANTLY, you must spray 110% of the plant. If you miss a spot, you might have to start over.

Good to know!! I'll respray tonight to make sure I got the entire plant!

Welcome

Did a thorough application of Neem oil last night!! Made sure it was under and over all the leaves, etc. I came outside this morning and found a ton of these guys again in the soil crawling around all over. What's interesting is I only see them in the soil and not on the plants themselves. Though something is definitely making holes in the leaves. So I wonder if I have two separate problems. Didn't find anything under any of the leaves, though.

I also have only seen these little guys in the soil of 2 of the 4 gardens but the leaf issue is present in all 4 raised gardens.

I was able to get a picture!! See these guys by the gnat (super zoomed in; they're pretty small)