To secure user passwords, it's best practice to store them using a hashing algorithm. Hashing takes the password and transforms it into a fixed-size string of characters (hash) using a one-way function. This makes it difficult to reverse-engineer the password from the stored hash.

The primary use of the Events module in Node.js is to facilitate event-driven programming. It allows you to create, emit, and handle custom events, making it a fundamental part of building real-time and responsive applications. Options A, B, and D are not the primary purposes of the Events module.

Creating a custom error class in Express.js is useful when you want to provide additional metadata with the error, such as error codes, status codes, or custom properties. This allows you to convey more context about the error to the client or developer. The other options are not typical use cases for custom error classes.

In semantic versioning, the 'minor' version should be incremented when new features or functionality are added in a backward-compatible manner. This indicates to users that they can safely update to the new version without worrying about breaking changes.

To optimize the rendering performance of template engines like EJS and Pug, enabling caching is a common approach. This allows the templates to be compiled once and reused, reducing rendering time. Additionally, minimizing template complexity and avoiding synchronous rendering can also improve performance. However, completely avoiding template engines may not be practical in many web applications.

When designing a schema for real-time analytics, indexing relevant columns is crucial as it speeds up data retrieval. Option (2) is also valid, as caching can significantly reduce database load. Option (3) might be a consideration but isn't the primary factor. Option (4) can be a trade-off, and it depends on the specific use case.

To access the properties of an object in JavaScript, you use dot notation like object.property. This is the most common and straightforward way to access object properties. The other options are not standard ways to access object properties.

To optimize write-intensive workloads in a database, it's crucial to minimize the use of "Locks." Locks can lead to contention and slow down write operations, especially in scenarios with high concurrent writes.

The Buffer.isBuffer method is used to determine if an object is a buffer in Node.js. It helps identify whether a given object is a Buffer instance or not.

To avoid blocking the Event Loop with CPU-bound tasks, Node.js developers can offload such tasks to "Worker Threads." This allows for concurrent execution of tasks, ensuring that the Event Loop remains responsive for handling other I/O operations and events.