Making a hardcover book online is easy, thanks to several online book publishing platforms. Here are the steps you can follow:

1. Choose an online book publishing platform: There are several online book publishing platforms available, including Blurb, Lulu, and Mixbook. Choose a platform that suits your needs.

2. Select the book size: Decide on the size of the book you want to make. You can choose from standard sizes or customize the size according to your preferences.

3. Choose the cover type: Select hardcover as the cover type.

4. Select a design template: You can either use the pre-made design templates or create your own design from scratch.

5. Upload your content: Upload your content, including text and images. You can also add page numbers and headers.

6. Customize the layout: Customize the layout according to your preferences. You can adjust margins, add text boxes, and change fonts.

7. Preview your book: Preview your book before you place your order. Make sure everything looks good.

8. Place your order: Once you are happy with the preview, place your order. The book will be printed and shipped to you.

9. Receive your book: Once your book is ready, it will be shipped to you. You can now enjoy reading your own hardcover book.

Overall, the process of making a hardcover book online is quite simple and can be completed in a few easy steps.