You only have a dual core processor in that system, so you might want to think about at least putting in a SSD, in fact I would say that this is a necessity if you go to High Sierra. I also consider 8 GB RAM to be a minimum these days and the upgrade to 12 GB would not cost you too much, just add in 1 x 8 GB stick.
If you do not want to do these upgrades then I would suggest that you go no higher than Mavericks 10.9.
I hope it helps.
Newest OS you can install from your current Lion is Sierra:Hi I have an early 2011 MacBook pro i7 @2.3 8gb ram
just did a internet recovery after installing a 1tb ssd
it downloaded 10.7
when I check for updates it says its upto date
how do I get later versions please