The best practice is to setup log backups periodically (if the database is not in SIMPLE recovery) in order to keep the database log size minimum. However there are some occasions even the log backup is setup, the log size keeps growing. To find out the reason you can refer, log_reuse_wait in sys.databases.
As per MSDN, log_reuse_wait is as follows; Also look at the log_reuse_wait_desc column for more detail.
Reuse of transaction log space is currently waiting on one of the following:
0 = Nothing
1 = Checkpoint
2 = Log backup
3 = Active backup or restore
4 = Active transaction
5 = Database mirroring
6 = Replication
7 = Database snapshot creation
8 = Log Scan
9 = Other (transient)
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