1. Used for unit testing the code
2. @isTest, testmethod, @testSetup are used
3. TestSetup is for setting the test data for the test class, as a test from one test method is not visible in another
4. Use a data factory for creating test data
5. Use mock responses for testing web services(static resource mock, httpcalloutmock, webservice mock)
6. Use Test.startTest, Test.stopTest to maintain within the limits
7. Using SeeAllData=true will allow the test class to access all the data of org.
8. System.runAs helps in executing a test class in user mode.

1. If code uses conditional logic (including ternary operators), execute each branch.
2. Make calls to methods using both valid and invalid inputs. (positive and negative testing)
3. Complete successfully without throwing any exceptions, unless those errors are expected and caught in a try…catch block.
4. Always handle all exceptions that are caught, instead of merely catching the exceptions.
5. Use System.assert methods to prove that code behaves properly.
6. Use the runAs method to test your application in different user contexts.
7. Exercise bulk trigger functionality—use at least 20 records in your tests.
8. Use the ORDER BY keywords to ensure that the records are returned in the expected order.
9. Not assume that record IDs are in sequential order.
10. Do not user SeeAllData=true if it is not necessary.

API What you can do with it

1. SOAP API Integrate your org’s data with other applications using standard SOAP protocols.
2. REST API Access objects in your org using standard REST protocols.
3. Metadata API Manage customizations in your org and build tools that manage your metadata model.
4. Tooling API Build custom development tools for platform applications.
5. Marketing Cloud API Expose Marketing Cloud capabilities with the REST API and get comprehensive access to most email functionality with the SOAP API.
6. Bulk API Load, delete, and perform asynchronous queries on large data sets.
7. Streaming API Send and receive notifications securely and efficiently. Notifications can reflect data changes in your org, or custom events.
8. Chatter REST API Build UI for Chatter, Communities, Recommendations, Files, Topics, and more.
9. Mobile SDK While it’s technically a software development kit, it’s worth including here. Integrate Native or Hybrid mobile apps directly with Salesforce.

• Prospecting
• Developing
• Negotiation/Review
• Closed/Won
• Closed/Lost

1. Convert Leads to Opportunities, Accounts, and Contacts
2. When you qualify a lead, you can convert the lead record into an opportunity. You’ll then work your opportunity until you close the deal either by completing it or canceling it.
3. Qualifying a lead indicates that you believe that the lead has a use for and interest in your products, and that a sale to the lead is a definite possibility
4. When you convert a lead, Salesforce uses the information stored in the lead record to create a business account, a contact, and an opportunity.
5. If your organization has person accounts enabled and the lead record didn’t include a company name, the lead is converted into a person account and an opportunity.