Please read my answer and bmikes comment before voting to close. Someone is going to come along and say I should just learn Mac shortcuts, but I must say I use Chromebooks, Windows, & Linux boxes and they all put the Control/Command key in the bottom left and right hand corner of the computer. I'm sorry but Changing 1 operating system is way easier then changing the other three(especially considering Chromebooks native shortcuts can't be changed).
To alleviate the most common keyboard shortcuts I have the left control key mapped to the command key on my apple computer. And have switched the right command and option/alt keys on the right hand side. I then switched command and control again in iTerm a very well made application.
Now unfortunately Control+Tab no longer works to switch between browser tabs. Well tabs in any application actually.
I would like Command+Tab=Control+Tab and Command+Tab+Shift=Control+Tab+Shift.
I am on El Captain using Karabiner Elements and would prefer to stay away from Karabiner(the older version). There is a github issue also opened currently with this issue.