I believe you will find it by reading the Book of Mormon, the Doctrine and Covenants, The Pearl of Great Price, and the Bible. Those are about the size of the Catechism of the Catholic Church and should take less time to read. Personally, I would find reading the entire Catechism cumbersome and would prefer a summary. But that's just me, I guess
You say you own a "Triple" -- that's where the doctrine is contained.
You might try reading it?
Many of your question might be answered that way?
Also, praying that Heavenly Father will show you the truth is always a help.