Making the right call: when to use a custom post type

You want to create a blog post about your recent trips to famous tourist destinations, including text, images, and personal anecdotes. Which content type should you choose?

You are launching a new online store and want to showcase your products with detailed descriptions, pricing, and shopping cart functionality. Which content type would be most suitable?

You are working on a blog post about the history of graphic design and want to include a PDF document as a reference for readers to download. Which content type would you choose to upload and attach the PDF file to your blog post?

You are creating a website for a photography portfolio and want to showcase your best images in a visually appealing gallery format in a static page. Which content type would you use?