Summarize the following:
This can be Word, Messages, TextEdit, or any other app that allows you to type text. It's in the menu bar at the top of the screen. It's at the bottom of the "Edit" menu. This opens the Emoji and Character Viewer on your Mac computer. You can also press Control+⌘ Command+Space to bring up the emoji and character viewer. It's in the column to the left. If you don't see a column on the left, click the button with the command symbol (⌘) in the top-right corner of the window to open the Character Viewer in full windowed mode. The Indian rupee is in the center of the currency symbols. This inserts the Rupee symbol in the text where your cursor is currently located. There are additional character variations in the lower-left corner of the Character Viewer.

Summary:
Open the app you want to type the Rupee symbol in. Click Edit. Click Emoji & Symbols. Click Currency Symbols. Double-click ₹.