How can I insert new rows and columns in ms excel?

Here is i am telling you simple2 Commands.

1: Press ALT i R (For Row Insert)

2: Press ALT i C (For Columns insert)

Forget the mouse Cursor :-)

You can do that by put the cursor at the column/row then press right click and select from the list insert option

Write Click on Any cell -> Select Insert  -> Select options (Coloms or rows)  

Press CTRL along with + to add the Column OR Row

Press CTRL along with - to delete the Column OR Row

SIMPLE MOUSELESS OPTION

right click on any column or row header and choose insert

1) Select any desired cell

2) Right click and choose "insert"

3) Add column or row)