If you want to showcase your works, then you need to install a free plugin called Portfolio Post Type.
Once you’ve successfully downloaded the zip file of the plugin, head to your WordPress Dashboard and select Plugins > Add New > Upload. Add the zipped file in the field there and click Upload.
Upon successful upload, you’ll be prompted to activate the plugin. You’ll then see a new Portfolio tab in your WordPress Dashboard Menu Sidebar.
Each portfolio entry has meta fields: you can set the client, role, link for your work.
To go to the Portfolio section in the Theme Customizer, go to Dashboard Menu: Appearance > Customize > Portfolio Posts.