Change Uppercase and Lowercase text in MS Word (ছোট হাতের অক্ষর থেকে বড় হাতের অক্ষরে পরিবর্তন )

                   Manual Process: 

1.  Top of the Word program in menu bar window, on the Home tab, click the Green Position icon, which has an uppercase 'A' and lowercase 'a' on it.

2. Then, select the appropriate option from the dropdown list. For example, if you want to change to all uppercase letters to lowercase letters, select the LOWERCASE option. If you want to change to all lowercase letters to uppercase, select the UPPERCASE option.

Keyboard Shortcut: Select text by Mouse Drugging-> Hold down Shift key and press F3 (Shift+F3)