To create portfolios, please refer to Create Portfolios for more instructions. After you have a set of portfolios with defined categories, you can choose to display them in different styles.
Step 1: Go to Pages --> Add new, then create a new page and choose Template Portfolio as its template type.
Step 2: Configure your Portfolio page with Portfolio Option. Here you can choose full width or boxed portfolio page. Also, you can choose number of portfolio columns and styles. Choose your filter (categories or tags) and pagination styles.
Step 3: Navigate to Appearance --> Menus and add your portfolio page to your menu.