Lots of Contentful website examples contain models for everything you would expect from a website. Standard pages, articles, authors, SEO, images, content blocks, etc. However, there is one subtle aspect that can get tricky, CTAs.
Content modeling can be a tricky thing. If done incorrectly, it can cause all kinds of headaches for editors. And trust me when I say going back to update the structure of your content after your project is live is worse. It's something you want to get right the first time.