Each page has a name and a title. The page's title is defined by the first line of the content text file as shown above. The name is derived from the page's filename by using only the filename part without the path and the extension (so, for example the file content/guide/overview.txt gets the overview name). For folders, the name is the directory's name and if a title is not defined (because a info.txt file is not provided), the title is the same as the name with an uppercase first letter.
Although it might work in some cases, it is highly recommended to avoid spaces in names and use only lowercase letters. Also you should not use the names index and info (except inside folders).
To link from one page to another, you just create a link using html with the A tag. The target of the link (the href attribute) is the page's name, plus the .html extension. For pages in a different subfolder, a relative path should be used with / as a path separator. To link to a subfolder, you should link to the foldername/index.html file.