Why learn git

Isn't this mostly nomenclature?

That is, mercurial bookmarks are like git branches, yes?

http://stevelosh.com/blog/2009/08/a-guide-to-branching-in-me... says:

"Branching with bookmarks is very close to the way git usually handles branching. Mercurial bookmarks are like git refs: named pointers to changesets that move on commit. The biggest difference is that git refs are transferred when pushing/pulling and Mercurial bookmarks are not."