Configure Unity Meta Files

Edit > Project Settings > Editor > Version Control

Set "Asset Serialization" to "Force Text" (Forces .meta files to be text)

Set "Mode" to "Visible Meta Files" (Forces .meta files to be created)

These settings are probably default now but it's good to check.

Create repository and ensure GIT LFS is configured

Run all of the following for each repository:

git init
git lfs install
git lfs track "*.psd"

Update ".gitattributes" with the following:

.gitattributes

Create ".gitignore" containing the following:

.gitignore

Verify and commit/push

git lfs track # Check which patterns are tracked by lfs
git lfs ls-files # Check which concrete file will be committed
git commit -am "Initial commit"
git push