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PRADEEP YADAV 3PRADEEP YADAV 3 

one example after insert using trigger.newmap

firdoss mohd 1firdoss mohd 1
Hi Pradeep,

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PRADEEP YADAV 3PRADEEP YADAV 3
please suggesting any website to practice more question on trigger
ANUTEJANUTEJ (Salesforce Developers) 
Hi Pradeep,

I found this below link, can you please have a look at it.

>> http://www.sfdcmeet.com/development/apex-in-salesforce/apex-trigger-salesforce/

I hope this helps and in case if this comes handy can you please choose this as best answer so that it can be useful to others that might face the same issue in the future.

Regards,
Anutej
ANUTEJANUTEJ (Salesforce Developers) 
Additionally, Have you checked trailhead it has detailed description and exercise problems please have a look at the trailhead link below, although there are two you can practice them and after which you can build your own scenarios to implement using trigggers:

https://trailhead.salesforce.com/en/content/learn/modules/apex_triggers

Also, I would suggest you to learn triggers best practices while you are learning the implementation part.
SwethaSwetha (Salesforce Developers) 
HI Pradeep,

Trigger.NewMap is only available in before update, after insert, after update and after undelete events

Please see below for detailed explaination:  https://trailhead.salesforce.com/en/content/learn/modules/apex_triggers/apex_triggers_intro

Also, the below is not salesforce official documentation but can help 
https://harshitcoder.blogspot.com/2017/08/all-trigger-examples.html
 
Hope this helps you. Please mark this answer as best so that others facing the same issue will find this information useful. Thank you
PRADEEP YADAV 3PRADEEP YADAV 3
Thanks Swetha
PRADEEP YADAV 3PRADEEP YADAV 3
Thanks Anutej