Read Hebrews 2
The writer of Hebrews talks about angels more than any other book in the Bible except for the book of Revelation. This is a topic that is highly interesting and often gripping to people, especially in Western Culture (North America and Europe) where the notion of a spiritual realm that impacts the physical has been highly dismissed by many.
However, the reality of a spiritual realm that both impacts and often times shapes the world around us is a reality that the Bible both addresses and assumes is true. There are, according to Scripture, beings that we know as angels who are “ministering spirits sent forth to minister for those who will inherit salvation,” as the writer points out here. What their exact work is, though, we may not be so clear on.
Scripture also addresses the other side of the Spiritual realm, that of Satan and his demons and the evil that he brings to this world. We know that this is a reality that we come up against all the time as well. The enemy is always working to thwart the plans of God and to deter, detract, discourage, and derail God and His work in the world through the Church. Paul points this out in his letter to the church in Ephesus:
For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms.
There is a really important point that the writer of Hebrews is trying to make here, however, which is that, as real as angels are, they are not the ones that bring salvation, Jesus is. Jesus Christ is infinitely more important than the angels, and all creatures in heaven and on earth are under his reign. So as fun as angels can be to talk about, and we should talk about them, it is much more important to keep our eyes focused on the one who brings salvation to the whole world.