There are numerous CMSs that are perfect for portfolio websites. Each platform offers different features and services. Most platforms charge a subscription fee. You should research the positives and negatives of potential platforms as they relate to you.
Adobe Portfolio is a good option as it is simple to use and is also provided free as part of your Adobe CC subscription.
With Adobe Portfolio, you can quickly and simply build a website to showcase your creative work. Adobe Portfolio allows you to focus on the work rather than the technical aspects of building webpages.
To get started using Adobe Portfolio follow along with the video below:
You can find more detailed guides and tutorials at Adobe Portfolio Documentation.