(I'm interested in the case of three pegs on each side of the head.) So when the strings are "properly" (according to those tutorials) installed, you need to turn counterclockwise in order to tighten the bass strings, and clockwise in order to tighten the treble strings.

Do it matter which way you tighten guitar strings?

Don't wind the string on the wrong way. It can cause hassle. ... Not only will you have to turn this tuner the 'wrong' way to tune up, the angle out of the nut is sharper and the string can get fouled or run against other tuners (neither of which is great for tuning).

Which way do you tighten acoustic guitar strings?

I like to tighten the string by hand. Make sure you're turning the tuner counter-clockwise. While you're doing this, keep the string taut by holding it down against the nut with your free hand. As you tighten, the folds you made in the string previously will make the string wind neatly down the tuner's peg.