Hello Jim,
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Now each time I want to add a new portfolio after that, I can create the portfolio post, save as draft,
You can Preview POSTS only like Regular Blog Posts or any Custom Post Type like Portfolio.
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and view it in the portfolio template page before publishing the post.
Portfolio Template page will display published portfolio posts only. Draft posts will not be visible.
Practice Makes The Perfect
Try some posts and you will be perfect with the passage of time. You will learn formatting, featured images etc after publishing two or three posts. After this practice, i believe you will be confident to publish the portfolio posts.
Thanks