To convert the current word or selected text to upper case click on menu Edit > Upper Case or press Ctrl+U shortcut.
To convert the current word or selected text to lower case click on menu Edit > Upper Case or press Ctrl+Shift+U shortcut.
Press Tab to indent a line or selected lines.
Press Shift+Tab to indent a line or selected lines.
Press Ctrl+Shift+2 or click on menu Edit > Convert Spaces to Tabs to convert all spaces at the beginning of each line to tabs.
Press Ctrl+2 or click on menu Edit > Convert Tabs to Spaces to convert all tab characters to spaces.