Does it matter which country I am in to pursue this dive?
The best news about studying Git/Github is that no matter where you are in the world, you can learn it. The number of online tutorials is endless. As long as you have an internet connection, you can learn Git/Github, even from your phone!

The bottom line, the answer is no: it doesn't matter at all which country you are in.  Wherever you are, you can start learning or improving your Git/Github skills.  Truly, these days, if you want to become an expert in Git/Github, you just have to dive in and work hard!  Remember the Break Diver's Creed: No Rules. No Excuses. No Regrets.