Creating a website that I want to sell later

In what way can I actually make a website, that I would maybe resell sometimes later,so I would actually own the whole website's appearance?
Could I do it through Wordpress? Since there are free themes available.
Or would I actually have to code the whole website? (myself or hiring a web designer)?
Can I just use a theme that I would completely customize?
What is the best practice for creating and then selling the website?

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