Mainly we use TriggerHandler to manage events like before update , before insert, etc . write one more class called TriggerHelper , in this classs we write methods to implement logic like when one field is updated do this do that, etc .

The important point in writing all these classes is to keep one trigger for one object and avoid…

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We can do things in Apex using Two ways

1. synchronous

2. asynchronous

if your answer is synchronous then go with Trigger, we can invoke a trigger after insert, after the update , before insert, before the update , etc