To devote is to give time, energy, resources, and even one’s life to something that is important. A person who is devoted makes sacrifices for good reasons so that something may continue.
In these sentences, the word "devote" is a verb:
Vanessa devotes her spare time to a shelter for homeless people.
She’s devoted to helping others. (Notice that it’s okay for a gerund to follow "devoted to.")
It’s important for a company to devote adequate resources to train and retain employees.
Many Catholic nuns devote their entire lives to helping people who are poor.
Police officers have devoted their lives in order to serve the communities in which they live.
LearnAmericanEnglishOnline.com is devoted to people around the world who want to learn English.
A nun is devoted to God.
The word "devoted" is used as an adjective:
Bob is a devoted husband and father.
Devoted funding for the school supports scholarships.
Liu is a devoted daughter.
The word "devotion" is a noun:
The teachers at that school are well known for their devotion to their students.
Bob gave all of his love and devotion to his family.
Years of devotion to his studies resulted in a Master’s degree.