In MS Word document, before using any short keys in MS Word (in order to edit anything) make sure to (almost always) select the text you want to make the changes in the MS word.
For Windows Users
Ctrl+N : Open New Word document
Ctrl+O : Open an existing Word document
Ctrl+C : Copy
Ctrl+X: Cut
Ctrl+V: Paste copied items
Ctrl+Alt+V: Paste special
In Ms Word, if you copied some text from other documents and paste in a different document then it will paste the text formatting of the source documents. So if you want to paste the text in your document applying your formating then you should use this [ctrl+alt+v] command and then select the Unformatted Text in the pop-up window.
Ctrl+P: Print the oped document
(if you want to print only some portion of the same document or word file, then select the portion of the word document and use the same command, then you have to select the Selected in the pop-up window. You can also choose the page numbers from and to for printing some pages.
Ctrl+F: Find
Ctrl+G: Go to
Ctrl+H: Replace
Ctrl+B: Bold
Ctrl+I: Italic
Ctrl+U: Underline
Ctrl+W: Close the document
Ctrl+A: Select all
Ctrl+J: Justified the text
Ctrl+E: Centered the text
Ctrl+L: Left alignment of the text
Ctrl+R: Right alignment of the text
Ctrl+Z: Undo
Ctrl+Y: Redo
Ctrl+Shift+<: Increase the text size
Ctrl+Shift+>: Decrease the text size
Ctrl+S: Save
Note: Please let us know what you think about these contents and what more you want to know about MS Word in the Comment.
