I recently posted how you can know if the Book of Mormon is true, here. It's a simple matter of reading the book we call scripture for yourself, and praying to know if it is true or not.
The reason I ask you to test the book in this way, is because it is the only sure way to know for yourself. The Holy Ghost is a testifier of truth. If you take the challange, as the prophet Moroni invites you to do, you could find out for yourself, for sure.
I did it.
And we encourage all to do it.
From the Book of Mormon come other precious promises, including promises of peace, freedom, and blessings if we “will but serve the God of the land, who is Jesus Christ” (Ether 2:12).
From its pages comes the promise of “never-ending happiness” to “those that keep the commandments of God. For behold, they are blessed in all things, both temporal and spiritual” (Mosiah 2:41).
From its pages comes the promise of “incomprehensible joy” to those who become “instrument[s] in the hands of God” in rescuing His precious sons and daughters (Alma 28:8; 29:9).
From its pages comes the promise that scattered Israel will be gathered—a work in which we are engaged through our great worldwide missionary efforts (see 3 Nephi 16; 21–22).
From its pages comes the promise that as we pray unto the Father in the sacred name of Jesus Christ, our families will be blessed (see 3 Nephi 18:21).
From a study of its pages comes the fulfillment of the prophetic promise that “there will come into your lives and into your homes an added measure of the Spirit of the Lord, a strengthened resolution to walk in obedience to His commandments, and a stronger testimony of the living reality of the Son of God.”
And from the pages of the Book of Mormon comes Moroni’s promise that through prayer, real intent, and faith in Christ, we may know the truth of these promises “by the power of the Holy Ghost” (see Moroni 10:4–5).
With other latter-day prophets, I testify of the truthfulness of this “most correct of any book on earth,” even the Book of Mormon, another testament of Jesus Christ. Its message spans the earth and brings its readers to a knowledge of the truth. It is my testimony that the Book of Mormon changes lives. May each of us read it and reread it. And may we joyfully share our testimonies of its precious promises with all of God’s children.” 
Read and ponder the Book of Mormon, then ask God if it is true with a sincere heart, real intent, and faith in Christ.
Then do me a favour: Have the confidence that the Holy Ghost will testify to you.
How did YOU come to know that the Book of Mormon is true?
If you have any experience of reading the Book of Mormon or praying to know for yourself, post it below with the plethora of others who have done the same. Go ahead, read their experiences and thoughts on the book. Be curious. Be prayerful. And be uplifted.
If you wish to order a free copy, let me know or click here.
Feel free to read or listen to it here.
 Read this. Thomas S. Monson, ‘Precious Promises of the Book of Mormon, Ensign, Oct. 2011