How do I use a trigger without a receiver? I use a Godox V860 flash.
Your question is poorly worded but I assume you are asking if you can use the Godox X1T wireless trigger with your Godox V860 without attaching an external receiver. The answer is no. The Godox v860 does not have a built-in 2.4GHz receiver needed to communicate with the Godox X1T transmitter. To use it with the X1T, you need an XTR16S receiver attached to the flash's hot foot.
If you have the newer Godox V860 II, then yes, you can use it with the Godox X1T transmitter, but you will need to read the manual and learn how to operate it.