Bulk safe Apex triggers are triggers that can handle large batches of records without hitting governor limits, such as the limit of 150 DML statements per transaction. One of the best practices for writing bulk safe Apex triggers is to add records to collections, such as lists or sets, and perform DML operations against these collections, instead of performing DML operations on individual records. This way, the developer can reduce the number of DML statements and optimize the performance of the trigger. For example, the developer can use a list to store the records that need to be updated, and use a single update statement to update the list, instead of using multiple update statements to update each record. Reference: [Bulk Apex Triggers], [DML Operations]