Where is the fountain of knowledge for learning about CNC setups / understanding them

[JAZZCNC]

Ok, so you have 5mm ball screws.

Now the Sw1 SW2 SW3 set the current range for the drives which must match or be just less than the motors rating. This setting can be set above the motors rating but recommended to keep on or just below.
In your case looks set at 1.8a for all motors even thou the motors are rated 3A. This is a common practice of manufactures when they use these cheap boards. They do it to protect the drives so not working at maximum and overheating.
What this means to you is that you are not getting the full power of the motors. However, it's double edge sword because if you turn them up you'll most likely fry the board unless put some cooling on it.

SW4 it doesn't mention but I suspect it will be to turn motor current reduction on/off. Currently set to ON. What this does is reduce the current to motors when at idle.
The amount of reduction is probably set by K3 K4. Currently set to 50% which is a standard current reduction on drives.

K1 K2 set the Micro stepping which looks to set at 8. Which means 8 x 200=1600 Micro steps.
However, I find it strange jumps from 2 to 8 because usually there's a 4 so can set 800Ms which is a common setting. So I'm not sure I fully believe these markings.
However, it's easy to find out now we know the pitch because the distance traveled will be exactly half or double what we set if wrong.

So start with what it looks to be set at and will take from there. So enter these settings in Motor Tuning.
One note makes sure you select the axis in motor tuning by clicking the axis buttons on the right-hand side when in motor tuning. Also, remember to save before moving to next Axis other wise you'll lose the settings. Also when you input settings into boxs click enter before moving to next box.

Enter these.
Steps per = 320
Velocity = 750
Acceleration = 300
Step pulse =0
Dir =1

These are very safe setting so should work. If you have OK movement but travels wrong distance then probably because switches K1 K2 are not setting MS to what they say they do, which again happens often on Chinese drives like these.

So if traveling wrong distance got 2 options. Change the steps per to exactly half or double 320. If moves half the commanded distance then double the steps and vise versa.

Option #2 let mach 3 do all the work for you by using the SET STEPS PER UNIT feature on the setting tab.(just above Reset)
This will ask you for distance to travel. Then it will travel ask you how far it moved.

So you'll need to mark the table or setup a reference point. Then accurately measure how far it moved. Digital Vernier gauge is good for this.
Can either measure by hand or Open the gauge up full and Zero it then let the machine push it closed.
The large the distance you can measure over the more accurate it will be.

This is good way to quickly set steps per if your unsure. While not always spot it gets you very close.

If machine isn't moving or moving badly then will need a video.

Question what computer are you using. Desktop or laptop.? And what cable.?
If machine isn't moving or moving irraticly then often Parallel cables give troubles so try another cable. It must be Straight-thru or whats called Null Modem cable not an Old printer cable which often cross over the pins.

If using Laptop then that's most likely your problem. Mach3 doesn't work well with laptops unless using motion control card.