Open tuning means all the strings are tuned to the notes of a chord either major or minor.Basically, there are three different open tunings, C, D and G. Every other so-called open tuning is a variation of one of these.

If you want to specialise solely in slide (bottleneck guitar) it would be a very good idea to learn these tunings. If you want to become more proficient in other aspects of guitar playing, then you should definitely learn standard tuning first and graduate to open tuning later.

Best of luck jOhn

Murray