What's the Difference Between Old Irish and Modern Irish?

In the Indo-European phonological system, you have a series of sounds that are like kua. Depending on whether they remained kua or gua in, you know, the daughter languages, then it's called a Q-Keltec language. But in a lot of Celtic daughter languages, that sound turns, kua turns into p-gua turns into b- actually, gua turning into b is, is everywhere. It's interesting because I think in italic, in the italic languages, you have the same thing. So, like Latin is Q italic, for example. And there are other attested extinct italic languages that have a P in all