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@@ -225,4 +225,87 @@ Line mode:
 		  It puts the mode in insert mode and put the cursor above
 		  the line where the current cursor is present.
 
+	* Replacing (Replace Mode):
+
+		@ Command :- Shift + r or CAPS + r (Capital r)
+
+		  What does it do?
+
+		  It pust the mode in replace mode. In replace mode, wherever
+		  the cursor is present, it will start to replace each character
+		  as we type and the previous character will be over-written by the
+		  new character.	
+
+	* Changing (Changing Mode):
+
+		@ Command :- <optional-register> + c + <word-motion>
+
+		  What does it do?
+
+		  It delete the series of bytes, based on the word-motion given,
+		  and put the mode in INSERT mode. <word-motion> can be any
+		  type of word motion that we have learnt. Here, <optional-register>
+		  can be used to put the deleted or "replaced" word into the register
+		  which we use to store as intended.
+
+		  For example:
+
+		  "a + c + w
+
+		  It will store the word into register "a which is replaced by using
+		  command c + w.
+
+		@ Command :- Shift + c or CAPS + c (capital + c)
+
+		  What does it do?
+
+		  Replace the sequence of characters from current cursor position is present at till end 
+		  of the line.
+
+		@ Command :- cc
 		
+		  Replace the entire current line where the cursor is present.
+
+		@ Command :- ~ 
+
+		  What does it do?
+
+		  Switch over the case of the character where the current is present.
+
+		@ Command :- g + ~ + <motion-command>
+
+		  What does it do?
+
+		  Switch over the cases of the each character based on the motion command
+		  range.
+
+		@ Command :- g + U + <motion-command>
+
+		  What does it do?
+
+		  Changes the entire case of each character to upper-case based on the motion command
+		  range.
+
+		@ Command :- g + u + <motion-command>
+
+		  What does it do?
+
+		  Changes the entire case of each character to lower-case based on the
+		  motion comand range.
+	
+	-> Joining:
+
+		@ Command :- Shift + j or CAPS + j (Capital + j)
+
+		  What does it do?
+
+		  Joins the line below the current line where the cursor is present
+		  to single line and add a space to it or add a double space if there
+		  is a period at the end of the current line.
+
+		@ Command :- g + J + <motion-command>
+
+		  What does it do?
+
+		  Do the same thing as "J" command. Only difference is that it doesn't
+		  add any space between joining lines.