Select the row below where you want the new row
Right-click the selected row
Click Insert
Or select the row and press Ctrl + Shift + +
To insert multiple rows, select the same number of rows first
Right-click the selection
Click Insert
Or go to Home
Click Insert
Click Insert Sheet Rows
To insert a row using the keyboard, use Alt + H + I + R
To insert a row in a table, right-click a cell in the table
Click Insert
Choose Table Rows Above or Table Rows Below