Notes on this article.

Variable Declaration

You must declare every variable with a data type in Apex.

SOQL Query

Salesforce Object Query Language. These statements are used to ‘query’ or return certain data stored in Salesforce.

Loop Statement 

This is used to perform a certain action iteratively until a specified point. For example to loop through a list so the program can perform an action on each item.

Flow Control Statement

Determines whether or not certain code should be run.

DML Statement 

Performs insert, update, upsert and delete operations on records in the database.

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