If you are making a limited repository that will not have a ton of images, then you can get away with simply git tracking your images in the main repository.
With this setup, no further action is needed. For example, with a file structure of:
./README.bigb
./Tank_man_standing_in_front_of_some_tanks.jpg
just use the image from
README.bigb
as:
\Image[Tank_man_standing_in_front_of_some_tanks.jpg]
which renders as:
Tank_man_standing_in_front_of_some_tanks.jpg
However, if you are making a huge tutorial, which can have a huge undefined number of images (i.e. any scientific book), then you likely don't want to git track your images in the git repository.

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