What John said!
But just to be clear: only Alexandre has git commit power. The rest of us have to send patches to wine-patches and keep improving them until he relents and admits that perhaps they're worthy of inclusion. :-)
Also, we tend not to worry too much about having bugs assigned. There are so many available that there is seldom any real duplication of effort.
Are there any areas in particular you're interested in?
If not, one great way to start is to look at bugs with keyword 'download' that have not been changed in > 90 days, see if you can reproduce the problem with current wine from git, and append your test results (either "bug still present in git" or "works for me with git") as a comment.
And once you've done a few of those, maybe you'll see one you can actually try to fix. Not every wine bug is hard. - Dan
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Dan Kegel