In the Photoshop window, the toolbox appears on the left of the screen. As you can see, Photoshop has an enormous array of tools available. Many of these tools also have options that appear in the options bar at the top of the screen. So from the options bar you can change paint brush size and shape, or for the text tool you can change the font and colour etc.
For example, if I select the text tool from the toolbox, along the top of the screen, I have some options I can change such as font, size, colour and so on.
Read page 18 of the textbook “Essential Photoshop Basics”.