[Kirandeep]

Custom Portal:-A Salesforce Customer Portal provides an online support channel for your customers—allowing them to resolve their inquiries without contacting a customer service representative. With a Customer Portal, you can customize and deliver a visually stunning user interface to your customers, and use the following Salesforce features to help you and your customers succeed.
Partner Portal:-A partner portal allows partner users to log in to Salesforce through a separate website than your non-partner users. Partner users can only see the data that you have made available to them. Furthermore, partner users can only manipulate data if you give them the appropriate user permissions.

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We can display up to 2000 records on a page.

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Yes we can use list of map in Salesforce
for example
List<Map<Id,Account> listofMap = new List<Map<Id,Account>>();

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Best Practices to write test Class :-
-Do not put (seeAllData = true) in test class otherwise, use it for exceptional cases.
-Use @isTest at the Top for all the test classes.
-Test in bulk
-System.runAs() method to test the functionality in user Context
-Use Test.startTest() and Test.stopTest() statement to increase Governor Limits

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Apex triggers enable you to perform custom actions before or after events to records in Salesforce, such as insertions, updates, or deletions. Just like database systems support triggers, Apex provides trigger support for managing records

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Different Types of Events :-
System Events.
Application Events.
Component Events.

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API call is the process of adding an endpoint to a URL and sending a request to a server. This is known as making an API call.

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Lightning Flow is a new Lightning Platform service that empowers any business to create and extend the power of process automation to any customer or employee experience. ... Now anyone can declaratively build and embed component-based processes, Lightning fast

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It is used to see the header of the report while they scroll if there are large set of data to be shown in the report.

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To enable floating report header in salesforce go to
Setup=>Customize=>Reports and Dashboards=>User Interface settings=>Click on enable floating report header.

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Printable View:
Formatting, Grouping and Subtotals are persisted (Retain the grouping as you see it on your report).
Export Details:
-Formatting, Grouping and Subtotals are lost.
-It exports the details of the report; meaning every line that makes up your report will be rendered as a new line in your .xls or .csv

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You can use SOAP API to create, retrieve, update, or delete records. You can also use SOAP API to perform searches and much more. Use SOAP API in any language that supports web services. For example, you can use SOAP API to integrate Salesforce with your org's ERP and finance systems.

[Kirandeep]

we can find the length with the use of predefind function length()
String var = 'hello'; // store the string the variable
Integer size = var.length(); // var.length() return the string length

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Compact layouts are used to display the key fields of a record whenever a summary representation of the record is needed. In this module, you create a compact layout for the expense object.

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The Apex Scheduler lets you delay execution so that you can run Apex classes at a specified time. This is ideal for daily or weekly maintenance tasks using Batch Apex.

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Batch Apex is used to run large jobs (think thousands or millions of records!) that would exceed normal processing limits. Using Batch Apex, you can process records asynchronously in batches (hence the name, “Batch Apex”) to stay within platform limits. ... Let's say you want to process 1 million records using Batch Apex.

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Answer is Profile and Record Type

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AssertEquals and System. AssertNotEquals both accepts three parameters; the first two (mandatory) are the variables that will be tested for in/equality and the third (optional) is the message to display if the assert results in false.

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Yes, this is possible that two or more users have the same profile in the Salesforce. But a single user cannot have more than one profile.

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Blob is a collection of Binary data which is stored as object. This will be used when we want to store the attachment in salesforce into a variable. This data type converts the attachments into a single object.

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Add the force:appHostable interface to a Lightning component to allow it to be used as a custom tab in Lightning Experience or the Salesforce mobile app. Components that implement this interface can be used to create tabs in both Lightning Experience and the Salesforce mobile app. This interface is a marker interface.

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SOAP is a messaging protocol specification for exchanging structured information in the implementation of web services in computer networks.
Whereas WSDL is is an XML-based interface description language that is used for describing the functionality offered by a web service.

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OAuth is an open protocol that authorizes a client application to access data from a protected resource through the exchange of tokens. ... In Salesforce, you can use OAuth authorization to approve a client application's access to your org's protected resources.

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-Master-detail relationship.
- Lookup relationship.
-Many-to-many relationship (junction object)

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A lightning:formattedText component displays a read-only representation of text, wrapping URLs and email addresses in anchor tags (also known as "linkify"). ... To display URLs and email addresses in a block of text in anchor tags, set linkify="true". If not set, URLs and email addresses display as plain text.