ABV: alcohol by volume. Assuming you’re European - but as an American, when I visited Germany, I found it was something yinz cared about less, presumably because most beers were 4.5% or 6% if it was heavy. American beer culture is much wilder, with lighter style beers ranging from 4-8% and the heavier as 6-15% sometimes as high as 20. Be careful, lol.

Bottle carbing is a method of carbonating in a bottle