Could someone write a white listing guide, don't really understand how it works, when i set it up and rebooted everything forced closed tiil I disabled HMA
The HMA Guide is under a complete overhaul and will include a section on using whitelist mode.
Along with a section on setting up Magisk to pass Play Integrity.
Splitting each section into separate pages for easier navigation and overall formatting and layout changes.
As a quick summary, white list mode works the exact opposite of blacklist mode.
It will hide all other process from what ever you apply whitelist mode to.
You then have to add the processes you want the said app to find.

Since system apps are normally safe for others to find (see note) you can use the Exclude system apps toggle if the app needs to have access to a system app/proccess.
Note: If you have an app that can be considered malicious or a security risk installed as a system app, then you will have to block the app from being found.
You can then also create a whitelist template with the apps that you want to be found and apply this template to the apps you use whitelist mode for.
You can also include additional apps that you want the app to be able to be found.
Hope it helps more than confuse.
Cheers.
PS.
73 is still doing most of the work updating the guide.
I am mostly the new editing and formatting/layout guy.