D76 is the most popular B&W developer of all time so it is more than decent but any general purpose developer will be fine: D76, HC110, ID11, etc.
Added note:
Developers are either in the form of powder or a liquid concentrate. Liquid developers are easy to mix and you can mix up just as much as you need each time you develop film. But, liquid types are heavier and shipping charges are higher if you order online. Powder developers take a little more work to mix and you must mix up the entire package.