oh-my-git/levels/tree-create/description

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Blobs just have some content and an ID. It would be convenient to be able to give names to a blob, right?
The second type of Git object is called a "tree" - a tree points a bunch of blobs, and gives each of them a name!
How can we build our own trees? Introducing: the index!
The index is like a "work in progress" version of a tree, where we can add and remove blobs. When we're happy with what we have built, we can make it into a real tree object!
We can use
$ git update-index --add <file>
to make the file's content into a blob, and to add that blob to the index using the file's name.
When we're happy with out index, we can convert it into a tree using
$ git write-tree
That command will output the ID of the newly crated tree.
Build a tree containing just the 'noises' file, which we conveniently placed in your current directory! :)