Most of your "SEO" is going to affect all engines, to some extent.
A huge majority of searches come from Google, which is obvious.
You can focus on making a minor increase in Google rankings, and see your hits jump by huge numbers...or you can focus on Bing (If you can find the info) and watch that 5 climb to a 6 or 7.
There is a reason that "Bing SEO" information is almost nonexistent. When something exists on the internet in vast amounts (Such as Google SEO info), that means two things:
1. It matters.
2. It probably works.
Enjoy your Bing hits. Then forget they existed.