Let’s walk through the items in the left navigation first. The first option you come to is your choice of Templates. The key is not to get too fixated on the wording or the image itself. You need to decide if you like the overall design, because of course, you can swap out the text and image at will. If you need extra ideas, simply type in a keyword, such as “wedding” and you will get all sorts of available options.
As a somewhat funny aside, I was a German major in college, and I had a professor of German who was afraid that if we made our German up as we went, we would commit the cardinal sin of using incorrect grammar. To shield us from this, he had us memorize about 30 of these yellow index cards, each with a phrase on it, such as “This casserole is amazing!” The idea was that we could swap out the appropriate verbs or nouns to adapt to the situation, such as “This castle is amazing!” or “This is chair is amazing!” However, one of these yellow cards had us memorize the unique phrase, “For a triumphal arch, I must say, this gate has an unusual form!” It was hard to see how we could swap much of anything for such a specific phrase! As funny as my experience was, the takeaway I leave you with is that Designer is pulling from German professor’s playbook: adapt the provided graphic to the situation at hand!