What solution is better for SEO? - To have a lateral menu to some anchors to the same page. - Or a lateral menu to different pages. The menu has only five or six links and the text to show are just some paragraphs.
More pages is usually better since 'one pagers' aren't viewed as very helpul or useful content and might be completely dismissed in the long term. I'd say multiple pages for a few reasons: - More room to focus on variations & derivatives of your central target theme - Content seperated into smaller easier to classify & index themes - A bit more volume (page count) - less likely to be disregarded by engines But for a short 'run through the gauntlet' a one pager might be just the ticket.
Links to the same page do nothing. Spread your content over a number of pages, and optimize each one. This improves your chances of being found on SE's.