Just like the WIX editor, you can change and customise anything on your site. You will probably find some changes you would like to make and ADI is perfect as it allows you too. The only difference is, if you want to change a part of the site, all the information shows in a column to the left of the screen. This can make your use of the ADI much quicker and get your website published as quick as a possible.
With the initial questions out of the way, Wix will ask you if you trust the ADI enough to let it build an example website for you, or if you want to build everything by hand. Going with the ADI is a much more efficient approach, especially since you can come back later on and customize every little detail of your site. You’re not stuck with the initial suggestions that Wix gives you.

If you’re using Wix’s free plan, then you won’t be able to use a regular domain name like “www.mysite.com” or “www.mysite.net” (domains like this come with Wix’s paid plans). Instead, your site will follow the format www.yourname.wixsite/yoursite, which is enough to get it up and running. But if you’re going for a more professional look, then we recommend upgrading to a paid plan to secure a more polished domain!  
First of all, you should know what your website will be about. This is the topic of your website. When starting to build a website WIX actually asks you this question, to suggest themes suitable towards your idea. You should also have an idea of what content is needed for the website. Is the website built on images, if it is a photography blog? Or/and, will you need an about page for example?