Apex

Here I am covering some important topics related to apex programming.

Topic 1: SOQL List For Loop vs SOQL For Loop 

Topic 2: Governor limits in salesforce 

Topic 3: With sharing and Without sharing in salesforce 

Topic 4: SeeAllData in Salesforce

Topic 5: Wrapper class in salesforce 

Topic 6: custom settings in salesforce

Topic 7: Call Apex Code from a Process builder in Salesforce 

Topic 8: Apex Code Best Practices

Topic 9: What is test class in salesforce? How to test callouts using HttpCalloutMock Interfaces?

Topic 10: How to handle UNABLE_TO_LOCK_ROW error in salesforce?