What are a couple of Considerations about Trigger? -...

Upsert triggers fire both before and after the insert or when update triggers as proper.
Merge triggers fires both
Field history isn’t recorded until the trigger end. If you question field history in a trigger, you won’t perceive any history for the present transaction.
You can just utilize the webService keyword in the trigger when it is in a technique characterized as offbeat; that is, the point at which the strategy is described with the @future keyword.
A trigger conjured by an insert, update or delete of the recurring event or repeating task brings about a runtime error when the trigger is brought in bulk from the Force.com API.
Merge trigger doesn’t fire their own trigger rather they fire update or delete of losing and winning records individually.

What are a couple of Considerations about Trigger?