These concepts are very important as we learn Excel.
It's important for you to understand them thoroughly.

A cell is a worksheet square. You can enter text and numbers and formulas. Rows are represented by numbers, and columns are represented by the alphabet. See the figure below.

Yes. That's a cell. You can enter text or numbers in the cells like this, and you can enter formulas as well.

It seems difficult at first look, but once you understand a few points, you'll be fine.
For example, let me explain the cell in which "Apple" is written. "Apple" is in the cell where the alphabet column and the number row intersect, isn't it? Therefore, when you are asked what word is written in "A2", you answer "Apple". So, where is "Company" written?

Yes, that's right! Okay. Look at the figure shown below again. If you type "A" using the keyboard, which cell is displayed?

Correct! If you look closely at the figure, "B3" is written in the upper left, isn't it? This is the address of the cell into which you currently are entering text or numbers. The cell is indicated by a black border that encloses it, and it is called a "cell address".

If it has a black border, it is called the "active cell". There is always one active cell only in the worksheet you are working in. If it were a map, it would be the "You are Here" mark. In other words, the "cell address" indicates the address of "You are Here", and the active cell is your current location.

That's right. A "worksheet" is something which holds a lot of "cells" so let's think of it as one page in a book of maps.
In the figure below "Sheet1", "Sheet2", and "Sheet3" are in the sections outlined in blue, aren't they? They are like "Page 1", "Page 2", and "Page 3" of a book.

Exactly! A "workbook" is something that holds "worksheets" so it is like a book that has many pages.