Generations ago, the Jew would begin each day, including Shabbat, with prayers at home. On Shabbat, the first two sections Birchot Hashachar and P’sukei d’zimra  were recited at home before joining a minyan. The Siddur is not only a Siddur for Shabbat and weekday, with prayers to be recited in a minyan. The Siddur contains a raft of personal prayers for important landmarks in ones life – a prayer for parents when children leave home, a prayer on retirement, a prayer before surgery etc. Moreover, there is an expanded study anthology of readings from the wisdom of Jewish religious literature from Talmud to today. The footnotes to be read at leisure also give one an enhanced understanding of the prayers be they recited privately or with a minyan.