When I click on any cell in the spreadsheet, the whole cell gets highlighted. If I want to change only a part of the value in the cell, I have to click in the command line.

Is there a way to get around this? In Excel, I can double-click my mouse or Press [F2] key to accomplish this.

Making spreadsheet cell editable from keyboard

Once the desired spreadsheet cell is highlighted, press the Insert key on the keyboard and the cell will now be editable like you desire.