How to do screen recording in windows 1?

In an operating system, the shell is a user interface that allows you to access the operating system's services. It is a program that acts as a layer between the user and the kernel, which is the core of the OS. The shell accepts commands or user input, interprets them, and then communicates with the kernel to execute the requested actions.

macOS is the proprietary operating system developed by Apple Inc. for its Macintosh line of computers. Known for its user-friendly interface, strong performance, and seamless integration with the broader Apple ecosystem, macOS is the second most widely used desktop OS after Microsoft Windows.

An operating system (OS) is the essential software that acts as an intermediary between a computer's hardware and the user. It manages all software and hardware resources to provide a stable, efficient, and secure environment for applications to run. In short, the OS makes a computer useful.

•How to install Windows (10 or 11)
Installing Windows involves creating a bootable USB drive using the Media Creation Tool from Microsoft's website. Insert the USB into the target computer, restart it, and access the boot menu to select the USB drive. Follow the installer prompts, including entering a product key if required. You can choose a custom installation to manage partitions. After installation, set up your account and update drivers.
•How to install macOS (from a bootable installer)
For macOS, download the installer from the Mac App Store and create a bootable USB using the Terminal app. Boot the target Mac from the USB installer by holding the appropriate key combination during startup. Use the installer, potentially using Disk Utility for a clean install.
•How to install a Linux distribution (e.g., Ubuntu)
For Linux, download the ISO file from the distribution's official website. Use a tool like Rufus or balenaEtcher to create a bootable USB. Boot the computer from the USB by accessing the boot menu. The installer will guide you through setup, including options for disk partitioning.

There are five main types of operating systems, though they can be categorized in different ways; the most common are General-purpose OS (like Windows, macOS, and Linux), Mobile OS (Android, iOS), Embedded OS (for appliances and wearables), Real-time OS (for critical timing, e.g., medical equipment), and Network OS (for managing network resources).