You can edit all the content present in the theme like Headings, Paragraphs, Links, Icons, Images, Buttons also whatever the text you see.
To edit, click customize which is located on the top bar, a left sidebar appears with all the customizable options and also you see the edit icon that is visible for each section in the theme after that click on the edit icon of which section you want to edit. After clicking the icon, you can start editing on the left sidebar.