There are three types of jigs in Irish music the most common type being the ‘double jig’. The double jig is in 6/8 time with two strong accents in the bar.

The second type is the slip jig which is in 9/8 with three strong accents in the bar. Slip jigs and double jigs might be played in the same set of tunes because though they are different (three accents instead of two) they are played at a similar tempo and have a similar feel.

The third type is the ‘Single Jig’ -more commonly called the ‘slide’- and it is in 12/8. The slide has a very different feel with four accents over the twelve beats: it has a great swing and is played quite fast. Slides are mainly associated with the Sliabh Luchra area on the Cork/Kerry border.
 
A Visit to Ireland.

Here is our first jig. This tune, as with many Irish traditional tunes, revolves around the scale and arpeggio of the Key it is in.
Notice how the A note is played .See how the 3rd finger holds down the F# on the 3rd string, 4th fret, and lets it ring out.[ bar 2 ],
In the second part of the tune, the little finger holds the D note and lets it ring out while the E string is played. [bar 9].
These techniques help to bring out the best sound of the instrument.
Remember the down-up-down motion of the right hand.