What are worksheets
Microsoft Excel consists of worksheets.
There are 3 worksheet by default.
Each worksheet contains columns and rows.
The columns are lettered A to Z and then continuing with AA, AB, AC and so on.
The rows are numbered 1 to 1,048,576

Cells
You enter your data into the cells on the worksheet.
The combination of a column coordinate and a row coordinate make up a cell address.
For example, the cell located in the upper-left corner of the worksheet is cell A1, meaning column A, row 1.
Cell E10 is located under column E on row 10. You enter your data into the cells on the worksheet
Move around a Worksheet
Move UP and DOWN, LEFT and RIGHT on the Worksheet with arrow key on your keyboard.

Select Cells
Selecting one cell
Click on the cell you want to select
Select B10
Selecting multiple cells
Hold down the left mouse button and dragging the mouse over the area.
Exercise
Select cells from A1 to F10
Selecting multiple cells at different locations
Press and Hold [ Ctrl] key and Click on the cells you want to select.
Exercise
Select A1, B10, C12, F3 together.