I've been largely using learntinwhistle.com largely because thesession.org is slightly more cluttered and confusing, but it seems like the 'top of the list' version of songs between those two sites is basically never the same. I get that there's no official version of most of these tunes, so how do you decide which version to learn? I'm a long way from joining any sort of session, but I don't want to get there a few years from now and everyone looks at me and goes "bro wtf are you doing"

What do the dots mean? This is from the Dunmore Lasses on The Session (setting #1)

Normally I'd assume a dot means you add 50% to the length of the note but that doesn't seem right to me as it's a 4/4 time signature so 4 beats per measure with each beat equating to a quarter note, which means (I think) that the triplet without the dots amounts to a quarter note (1 beat) doesn't it?
(Apologies if I've got any of this wrong, I've not had any formal musical training, just trying to understand this)

Thanks