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".
For example:
Kann ich deinen Platz behalten?
Also it does not come the meaning "to maintain sth." as "beibehalten".
For example:
Ich behalte meine Geschwindigkeit bei.
I am confused about this word, and not able to realize how and when to use it.