We've packaged our Git (and GitHub) lessons as a series of 'tours'. Each tour consists of a series of lessons and covers the Git knowledge required for a specific usage.
Git Tours
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├── Tour 1
│ └── Lessons: T1L1 → T1L2 → ... → T1L6 → Usage: Save snapshots of a folder
├── Tour 2
│ └── Lessons: T2L1 → T2L2 → ... → T2L6 → Usage: Backup folder history on the cloud
├── ...
└── Tour N
└── Lessons: ... Usage: ...
To get started on the first tour, click here.