How to make a repository config up-to-date

I've got a number of a little over one year old repositories I do my
private stuff into.  Looks like in that year things changed quite a
bit (remote going from files to some kind of config file?  reflog
stuff?).  What should I do to change them to what would be considered
an up-to-date, full bells-and-whistles configuration?

  OG.