The amounts of time someone must fast, varies according to the transgression. Giving Tzedaka is also comparable in it's atonement power.

Fasting can also be used as a gift offering, an appeasement worship to rectify a wrongdoing

Tanya for the 9th of Tammuz ט' תמוז

Tanya for the 10th of Tammuz 'י תמוז

The various contractions aid in the infinite light of Hashem to reveal G-dliness even to the point of CHochma.

G-d's Chochma, the source of everything, the first primary source of revelation. In our souls as well, Chochma is the origin point, until we come to the by-product- action. By G-d however, Chochma would be compared to our action, meaning, it is a by-product, many steps removed from the origin point. In fact, our action is not even as far removed from our initial point. We are finite beings with finite spectrums. The relationship of Chochma to the source of G-d's revelation is even beyond description. This comparison is merely metaphoric.

The relationship of G-d to this world is unaffected by physicality, unlike the relationship of a soul to the body.

Constriction, Tzimtzum, is mistakenly conceptually understood that there is a space created void of G-dliness. However, after understanding G-d's omnipotent wisdom, it is clear that no place is empty of G-d.

What you're looking at in the physical world, what you see is a product of the contraction of G-d.

"You shall know today that ... there is nothing but Him." Every G-dly attribute has a seemingly opposite G-dly ability to be nullified to and even blended with.