For the first part of your message: make sure you have understood the precise concepts well. Otherwise, reread if necessary. Always without haste.
For the second part of your message:
1) As noted in the Demons of Hell section, the Gods are associated with specific days of the year and these periods belong to them. For this reason, the Demons that connect to certain days are marked in the calendar.
2) On the dates in which things like: "love, children, home, family" are written, it is possible to start work that has to do with these subjects. On dates such as: "money, authority, charisma, honor" it is possible to begin spells referring to money, authority, charisma and honor. Obviously the dates being marked days of power it is much better to start your spells on those marked days.
Nobody forbids you to start your spells on other days too obviously, especially if you have real urgencies, but if you want to have a good result it can be extremely useful to resort to those days of power. Just try to be clear about when the voids of course begin and end. They are marked on the calendar. If I want to do a love ritual it would be better to perform it on the first day, for example, waiting for the Moon in Libra and favorable Venus, instead of doing it during the Moon in Aquarius or in another sign that has nothing to do with the Love.
I hope I understood and answered your question.