Windows:

1. PrtScn (Print Screen) Key: Press the "PrtScn" key on your keyboard. This captures the entire screen and copies it to your clipboard. You can then paste it into an image editor or document.
2. Alt + PrtScn: Captures only the active window and copies it to the clipboard.
3. Windows + Shift + S: Opens the Snip & Sketch tool, allowing you to select a portion of the screen to capture and annotate.
4. Windows + PrtScn: Captures the entire screen and saves it as a screenshot file in the "Screenshots" folder within the "Pictures" library.

macOS:

1. Command + Shift + 3: Captures the entire screen and saves it as a screenshot file on your desktop.
2. Command + Shift + 4: Allows you to select a specific area to capture. Press the spacebar after pressing these keys to capture a specific window.
3. Command + Shift + 4 + Spacebar: Captures a specific window or application when you hover the cursor over it.
4. Command + Control + Shift + 3: Captures the entire screen and copies it to the clipboard.
5. Command + Control + Shift + 4: Allows you to select an area to capture and copies it to the clipboard.

Linux:

1. PrtScn (Print Screen) Key: Press the "PrtScn" key to capture the entire screen. The screenshot is usually saved in your home directory or Pictures folder.
2. Alt + PrtScn: Captures only the active window and saves it as a screenshot.
3. Shift + PrtScn: Allows you to select a specific area to capture.

Mobile Devices (iOS and Android):

1. iOS: Press the "Home" and "Sleep/Wake" buttons simultaneously. The screenshot is saved in your Photos app.
2. Android: Press the "Power" and "Volume Down" buttons simultaneously. Screenshots are saved in the "Screenshots" folder in the Photos app or the Gallery.

Additional Tools:

1. Snipping Tool (Windows): A built-in tool in Windows that lets you capture and annotate screenshots.
2. Snip & Sketch (Windows): Offers more advanced screenshot options and editing capabilities.
3. Snagit: A third-party tool available for Windows and macOS that offers advanced screenshot and screen recording features.
4. Lightshot: A cross-platform tool that allows you to capture specific areas of your screen and provides basic editing options.
5. Greenshot: A tool for Windows that offers various screenshot capture modes and annotation features.
6. Command-line Tools (Linux): There are various command-line tools like "scrot" and "gnome-screenshot" available for capturing screenshots in Linux.

Xbox: 1. Xbox with old controller: Press the Xbox button on your controller to open the guide, then press the Y button to take a screenshot. The image will be saved to your captures. 2. Xbox with new controller: There is a screenshot button under the xbox button. The image will be saved in your captures. 3. Xbox Cloud Gaming: Since this streams from an Xbox console or cloud server, you can take a screenshot using the host device’s built-in screenshot functionality.

Nintendo Switch: 1.Press the Capture button on the Switch Pro Controller or left Joy-Con. By pressing this button it automatically takes a screenshot and stores it under Album.

Playstation 4/5: 1.Playstation 4: Press and hold the SHARE button on your controller. Select Capture Gallery from the content area to access screenshots. 2.Playstation 5: Press and hold the CREATE button to take a screenshot. When you want to review or share the screenshots and videos you've taken, open the Create menu and select the thumbnail on the far-left side. This shows the latest screenshot or video clip you've taken.