a. It supports Non-Primitive Data types.

b. Chaining jobs: You can chain one job to another job by starting a second job from a running job. Chaining jobs is useful if you need to do some sequential processing.

Callouts are not allowed when there is an uncommitted transaction pending. For example, if a save point is set before a DML operation, a callout cannot be made based on the results of that operation to commit or roll back the save point.

You cannot perform a DML operation prior to a callout. All the DML operations should be invoked only after you are done with callouts. So, make a webservice callout first and then save the request.

Crypto Class provides methods for creating digests, message authentication codes, and signatures, as well as encrypting and decrypting information.

Go to Debug Mode in Setup and enable Debug Mode for the user..

5. Custom Formatters in Browser tool for LWC Inspection
Lightning web components use JavaScript proxies to enforce that certain types of data are read-only, primarily data that’s provisioned via decorators (@api, @track, @wire). In Debug Mode, custom formatters manipulate the proxies into readable parts. Then in Chrome DevTools, you see the real value instead of the proxy. Let’s enable the custom formatters.

In DevTools, click Settings (settings icon). The Preferences page opens.
Under Console, select Enable custom formatters.

If the endpoint is unavailable, messages stay in the queue until sent successfully or until they are 24 hours old. After 24 hours, messages are dropped from the queue. 

Process mapping creates visual representations of business processes. It includes any activity that defines what a business does, who is responsible for what, how standard business processes are completed, and how success is measured. The main purpose of business process mapping is to show the relationship between the steps and the inputs of a business to establish a clear, consistent, and concise result. It takes a specific objective and compares that objective to the organization’s overall objectives to make sure their processes are aligned with the company’s values and capabilities.

@InvocableMethod

To maintain optimum performance and ensure that the Lightning Platform API is available to all our customers, Salesforce balances transaction loads by imposing two types of limits:
1. Concurrent API Request Limits
2. Total API Request Allocations

Concurrent API Request Limit is a request with running duration of 20 seconds or longer.

https://developer.salesforce.com/docs/atlas.en-us.salesforce_app_limits_cheatsheet.meta/salesforce_app_limits_cheatsheet/salesforce_app_limits_platform_api.htm

There is still one use case for @track. When a field contains an object or an array, there’s a limit to the depth of changes that are tracked. To tell the framework to observe changes to the properties of an object or to the elements of an array, decorate the field with @track.

So, it is required for array and object.

11. How to Salesforce supported certificates?
To review a current list of supported certificates you can append /cacerts.jsp to any instance URL (Only Winter ’19 Instances will work with this endpoint) – https://INSTANCE.salesforce.com/cacerts.jsp (replace ‘INSTANCE’ with any Winter’19 upgraded instance, e.g. https://cs32.salesforce.com/cacerts.jsp )

Reference Article – https://help.salesforce.com/s/articleView?id=000326722&type=1

12. Record Type assigned via Permission Set not working in Salesforce 

UX designis the practice of examining people’s needs and motivations to inform the design of the overall experience with a product or service.

Even if you use ORDER BY, the order of results can vary if there are duplicate values for the fields you’re using in the ORDER BY clause. Reference Article – https://developer.salesforce.com/docs/atlas.en-us.234.0.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_select_orderby.htm

15. Your query request was running for too long
[sf: QUERY_TIMEOUT]. Reason [QUERY_TIMEOUT: Your query request was running for too long.]

If the query runs more than 2 mins(120 seconds), the query times out and throw the exception.

Maximum
SOQL query run time before Salesforce cancels the transaction is 120
seconds(2 minutes). Check the following reference article.
https://developer.salesforce.com/docs/atlas.en-us.232.0.salesforce_app_limits_cheatsheet.meta/salesforce_app_limits_cheatsheet/salesforce_app_limits_platform_apexgov.htm

Use
“SOQL_EXECUTE_BEGIN” in the Debug Logs. Find the start time and the
time of the exception. If it is 120 seconds, then optimize the query.