If you already have a website which you’d like updated, or rebuilt from the ground up, it’s helpful, obviously, to know what you still like about it. Colors, layout, wording, images, tools: any element we’ve discussed so far which still works for you. Let’s not reinvent the wheel, eh?
Go through page by page, element by element on each page, and make a note of everything you assume will still be there after the redesign. Make notes of things you assume are just part of the website. Remember, unless you intentionally choose to keep it, it’s not necessarily going to be part of your redesigned website.
This is another question that’s about intent; making choices overtly instead of making assumptions.