Knead the dough by hand or with a stand mixer fitter with a hook dough attachment, until it’s soft and smooth (it will take about 5 minutes with the mixer). When you follow the recipe (especially if you weigh the ingredients, instead of using measuring cups), the dough should be perfect, but if for some reason it’s not, add some water if it’s too dry, or a little bit of flour if it’s too wet. If the dough already forms a ball, is relatively smooth, but still tough, it means that it’s not ready, it must be further kneaded until soft and elastic (after resting time it will be even softer).