Like Git itself, Dulwich consists of two main layers; the so-called plumbing and the porcelain.

The plumbing is the lower layer and it deals with the Git object database and the nitty gritty internals. The porcelain is roughly what you would expect to be exposed to as a user of the git command-like tool.

Dulwich has a fairly complete plumbing implementation, and a more recently added porcelain implementation. The porcelain code lives in dulwich.porcelain.

For the large part, this tutorial introduces you to the internal concepts of Git and the main plumbing parts of Dulwich. The last chapter covers the porcelain.