I have made my research about this word and found it means "to keep".
However it doesn't come in the sense of "to have possession" of sth. as "behalten".
Kann ich deinen Platz behalten?
Also it does not come the meaning "to maintain sth." as "beibehalten".
Ich behalte meine Geschwindigkeit bei.
I am confused about this word, and not able to realize how and when to use it.