Praying for the Saints Intercession

Why pray to the Saints?

According to the Catholic Church, a "saint" is anyone in heaven, whether recognized on Earth or not, who form the "great cloud of witnesses" (Hebrews 12:1). These "may include our own mothers, grandmothers or other loved ones (cf. 2 Tim 1:5)" who may have not always lived perfect lives but "amid their faults and failings they kept moving forward and proved pleasing to the Lord". The title "Saint" denotes a person who has been formally canonized, that is, officially and authoritatively declared a saint, by the Church as holder of the Keys of the Kingdom of Heaven, and is therefore believed to be in Heaven by the grace of God. There are many persons that the Church believes to be in Heaven who have not been formally canonized and who are otherwise titled "saints" because of the fame of their holiness. Sometimes the word "saint" also denotes living Christians.
According to the Catechism of the Catholic Church, "The patriarchs, prophets, and certain other Old Testament figures have been and always will be honored as saints in all the church's liturgical traditions."
In his book Saint of the Day, editor Leonard Foley, OFM, says this: the "[Saints'] surrender to God's love was so generous an approach to the total surrender of Jesus that the Church recognizes them as heroes and heroines worthy to be held up for our inspiration. They remind us that the Church is holy, can never stop being holy and is called to show the holiness of God by living the life of Christ."
The Catholic Church teaches that it does not "make" or "create" saints, but rather recognizes them. Proofs of heroic virtue required in the process of beatification will serve to illustrate in detail the general principles exposed above upon proof of their "holiness" or likeness to God.

General Roman Calendar For the Year Saints- Canada -Wikipedia

Want to know more more about saints?
Try https://catholicsaints.info/
or en.wikipedia.org/wiki/Patron_saints_of_ailments,_illness,_and_dangers or en.wikipedia.org/wiki/List_of_patron_saints_by_occupation_and_activity