Additionally, standard notation requires a roman numeral positioning to denote where to place your slides.
Tablature is much more direct.
Ultimately, it's best to become well-versed in both standard notation and tablature. The letters to the right of each line represent the name of the string. So visually, you're looking at the Dobro strings, as represented by these lines, as upside down. If you were to tap your foot in a rhythmic manner as you count to four methodically, you have the beat of the piece. You'll notice also the line that separates the two measures that run vertically through the tablature.