In the digital age, security is of paramount importance, especially when it comes to user data and credentials. As developers, we must ensure that sensitive information, such as passwords, is stored securely to prevent unauthorized access and potential breaches. One of the key techniques employed to enhance security is password hashing, and in the realm of Node.js development, the bcrypt library stands out as a robust solution for this purpose.

The command-line interface (CLI) can be a powerful tool for developers. You can use it as part of your development workflow to add new features to your application and to perform tasks in a production environment. Laravel allows you to create "Artisan commands" to add bespoke functionality to your application. It also provides a Process facade that you can use to run OS (operating system) processes from your Laravel application to perform tasks such as running custom shell scripts.

Primary keys are vital in the design of a relational database. They are crucial in uniquely identifying records. For example, if you have a table of users, you will need to identify each record uniquely. This is where primary keys are used. Primary keys are usually single columns that auto-increment. There might be cases where you'll need a combination of column to serve as the primary key - this is where composite primary keys become helpful.