All my life I have used Windows as my main operating system and I have helped others with they're mis-hap and troubles as my own.
I have used mostly free ware and wiping HDD for clean install for friends, family and strangers all for free. I built many PC's and done it either free (90%) or very little money.
One day I bought my wife (the last white unibody) macbook, and I had to figure out how MAC works and it was amazing. I have the first 11" Air and never going back, because holy sh***** I don't have to do anything!
So, I think I have fallen to stupidity because I don't know any trouble tasking solutions and I have to know what and how I will fix my mac in the future if something goes TERRIBLY wrong!!! Any software (Apps) or commands I should be knowing?