Google's free website building tool provides a simple system with pre-made designs and no advertisements.

Google's free website building tool provides a simple system with pre-made designs and no advertisements.
The management interface of this free system allows you to open pages, file folders, mini-blogs and more.
You can not get a real address but a folder under the address of the system but, Google allow the referral of your domain to the free site.

Google Sites is a website building system from Google and it is not commercial, you do not have to pay for it at all and it is free of ads (except for a small credit in Potter).

A few years ago Google did a facelift to the service, but it is still very basic relative to the other systems I mentioned, and in fact it is more reminiscent of a slide design tool than websites.
For each page you choose the layout you want and can add different elements. The advantage of the system lies in the fact that it is very easy to add elements from the world of Google, for example:

*Youtube videos

*Calendar

*Docs documents

*Forms

*Spreadsheet and graphs based on them

In terms of SEO and very ironically, it is simply ineffective: it uses the title tag of the page name you give, but without the description tag. At least you can still give each page a custom address and block it from entering Google's index.