Many critics and teachers believe that Beowulf contains themes that are relevant to modern life.

Since this is a statement, not a question, I am not sure
what information you need, but I'll attempt to answer based on what I see in the text.
Beowulf does contain universal themes that are still relevant
today. One of the key things Beowulf examines is the idea of
fellowship and loyalty to one's friends. It also deals with honor and keeping promises
in that Beowulf has come to a strange land with the express purpose of helping a group
of people that are not even from his own country. It looks at the importance of kinship
and the effect that has on one's actions.

Another relevant
themes that Beowulf explores is the idea of greed and its
consequences, partcularly through the story of the dragon and the treasure. I'm sure you
can find other themes that are also relevant, but these are some of the main
ones.