The Odes of Solomon are a collection of early Christian hymns. It's estimated that they were written at the end of the first century AD. There is no claim of authorship, so it's uncertain why these hymns are connected by name to Solomon. The Odes of Solomon are separate from the Psalms of Solomon, which are a set of eighteen psalms written around 60 BC in response to the Roman invasion of Israel.
The Odes of Solomon is not a part of the Bible or considered divinely inspired. The Bible contains songs and hymns, such as the book of Psalms, but the Odes are not part of that nor any other inspired book. The Bible teaches the sufficiency of God’s revealed Word (Deuteronomy 4:2; 2 Timothy 3:16-17; Revelation 22:18-19). While extrabiblical texts, such as the Odes of Solomon, may be of historical interest, believers should always use Scripture as the standard, measuring any any outside instruction against the wisdom of God’s Word (1 John 4:1; Colossians 2:8)
The hymns within the Odes of Solomon are poetic, which makes the content within them easier to learn and call to mind later. Since they are not part of the canon of Scripture, some details and doctrines expressed within them may not perfectly line up with the Bible. Some people have suggested that some of the odes perpetuate Gnostic heresies; however, there is no explicit Gnostic teaching in the Odes of Solomon.
As far as topical content goes, one thing that is interesting about the Odes of Solomon is how they describe the Trinity and direct worship individually to the Father, Son, and Spirit at different points. There was not a big time gap between the life of Christ and these writings. At the same time the Odes of Solomon were written, the New Testament was being completed. It's commonly believed that Ignatius of Antioch, a possible student of John the apostle, quoted portions of the Odes of Solomon in his own writings.
Some have tried to claim that Trinitarian theology was not believed until centuries after Christ. However, because of the historical link between the New Testament and the Odes of Solomon, instead we see that the theology of the Trinity was present right after the life of Christ. It was later more explicitly and overtly codified in response to heresy.