Click the Windows logo in the bottom-left corner of the screen. Type snipping tool into the search bar, then click Snipping Tool at the top of the Start menu. Click Mode at the top of the Snipping Tool window, then click Rectangular Snip in the resulting drop-down menu. Doing so will both set the Snipping Tool to use the "Rectangular Snip" feature and place your screen in screenshot mode. In the future, "Rectangular Snip" will be the default and you can just click New on the left side of the Snipping Tool window to create a new snip. You should see a red outline appear around the section you're highlighting. If you want to take a screenshot of the entire screen, click and drag from the top-left corner of the screen down to the bottom-right corner. Once you let go of the left mouse button, your screenshot will be taken. You should see the screenshot appear in Snipping Tool. You can save the screenshot as a picture file on your computer by doing the following:  Click the floppy disk-shaped "Save" icon at the top of the Snipping Tool window. Enter a file name in the "File name" text box. Select a folder in which to save the screenshot on the left side of the window. Click Save. Clicking Mode at the top of the Snipping Tool window will prompt a drop-down menu with the following options, each of which can be used to take a different kind of screenshot:    Free-form snip — Allows you to select a section of your screen by free-hand clicking and dragging around it. Releasing the mouse once you've connected the end of your selection to the beginning of the selection will take the screenshot.  Window snip —  Allows you to take a screenshot of a currently open window (e.g., your browser window) without including anything else. Clicking a window will take the screenshot.

TL;DR in Vietnamese:
Mở trình đơn Start. Mở Snipping Tool. Thiết lập chế độ thành "Rectangular Snip". Nhấp vào và thả chuột ở phần màn hình mong muốn. Thả chuột. Lưu ảnh chụp màn hình. Thử sử dụng nhiều kiểu chụp màn hình khác.