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Kindly mark it as the best answer if it works for you.
Thanks & Regards,
Priya Ranjan
Salesforce official document is available to learn the Apex and trigegrs.
Kindly refer this link to learn Apex trigger :-
https://trailhead.salesforce.com/en/content/learn/modules/apex_triggers
For Apex class :-
https://trailhead.salesforce.com/content/learn/modules/apex_database/apex_database_intro
If you still get any question, you can let us know.
Kindly mark it as the best answer if it works for you.
Thanks & Regards,
Priya Ranjan
Just Simple, follow below url that's will help for make your concept strong
https://trailhead.salesforce.com/en/content/learn/modules/apex_triggers/apex_triggers_intro
https://blog.insycle.com/apex-triggers-in-salesforce#:~:text=Apex%20triggers%20within%20Salesforce%20are,to%20existing%20data%2C%20or%20deletions.
if you need any assistanse, Please let me know!!
Kindly mark my solution as the best answer if it helps you.
Thanks
Mukesh