In Windows, The PrtScn does the magic. Macbook has a built function to capture screenshot press ⌘ command+shift+4.
In Linux, just pressing PrtScn button lets you capture the screen.
In Chromebook, pressing ctrl+ buttons are enough to get the work done.
In an iPhone 8 Plus & earlier, push down the Sleep/Wake and Home button simultaneously.
In iPhone X and Later Press Sleep/Wake+Volume up Buttons at same time
In Android Phone and Samsung Phones, By pressing the Power button andVolume Downat same time to capture screen
You have learned how to take a screenshot in any Windows, either it is XP or Windows 10, Windows 8/8.1, Windows 7, Macbook either it is Air or Pro, iMac Pro, Linux either KDE Plasma, Gnome, XFCE, Ubuntu or Mint, Screenshot On Android either Pie or Oreo Android 10, iPhone either it's iPhone 5/6/7/8 Plus OR iPhone X/XS Max, iPhone 11 Pro Max, Screenshots on a Chromebook Acer, and PC & Desktop, HP/Dell/Microsoft/Lenovo/Acer/Asus/Razor Laptop.