Translation of excuse in Spanish

I was wondering if you can tell me if few words how to study here because I don't know that's why I'm not on line most of the time,thanks. Can you help me explaining me how to do the lessons, I still don't understand it
I would like to chat with you regularly, but it looks like you are not online at the moment. I heard about the political turmoil in your country, and I hope that it is not going to affect you.
We walked almost every alley in Cusco, stunned by its beauty and ignoring the developing altitude thickness, which resulted in the most horrible night of our lives.