Noob here, need help with Takeout

[Davidbazon]

So, summary - My storage has ended and I want to leave Google Photos and, obviously, take my library with me. I noticed that Google Takeout likes to shred the metadata and put it in a separate .json file and for my phone gallery to organize my photos correctly, it needs that metadata. Metadata Fixer is a paid program which uses ExifTool, free software. I'm not willing to pay for a program which is a GUI on top of ExifTool, and I need help. I've tried very many commands I found online with ExifTool and none worked correctly. I know, you're probably tired of seeing this topic but I really want an up-to-date tutorial on how to organize and merge the metadata extracted from the .json into the actual photo.
Here's some info:
OS - Windows 10
ExifTool version - 12,40 as shown in the folder name
~12.000 photos I need to process

Thanks everyone.

[StarGeek]

I noticed that Google Takeout likes to shred the metadata and put it in a separate .json file

It does not.  The metadata in the file is exactly the same as when you uploaded it.  The only reason you need to try and import data from the json files is if you entered data on the Google website.

Otherwise, see here.  Use CMD to run the commands, not PowerShell, as PS is not very exiftool friendly.