One way that you can ensure that your users understand and find the important areas of your design is by using emphasis.
Emphasis means that an object or element is attracting attention.
There are several ways to add emphasis to your designs.
Size
A great example of size is the visible text within an app's design. Using a larger size for the title of the page, like "watermelon" in the image below, helps to orient the user. That page name should be bigger or bolder than the rest of the text on that page to show the importance of that specific text.
Contrast: Creation of opposing visual elements to convey emphasis or comparison.
the checkout cart and "order" buttons are colored bright red and purple which contrasts with the otherwise white and gray app.
Texture: