I had to take a look when some other people whose opinions I highly respect mentioned that Gajix was fantastic. So....I took a look...

Wow, brilliant! To be fair, my use case is a little different from the intended purpose. I can immediately use this to create mini-tutorials on topics that my potential users are definitely searching for, as ToF (Top of Funnel) articles. Packaging the generated tutorial as a single-page mini-course, with a navigable ToC (Table of Contents) becomes so easy, and the resulting webpage is very usable for my website visitors.

The quality of output is fantastic. There are a few improvements that I would love to see:

1) When we ask a question and get an answer, give the option to add it to the TOC.
2) Allow users to rearrange the TOC.
3) Allow users to specify a TOC template that can be reused. My use-case: I’m using Gajix to create mini tutorials to host on my website. Once I’ve found a TOC structure that works well, I want to create a similar mini-tutorial for each topic – using the same TOC structure. Preferably, I don’t want to copy-paste the TOC either….so it would be nice to have a ‘saved TOC template’ that I can use as a starting point, and just modify it for the next Excel function.
4) I’d really like to be able to export or download an entire topic in various formats, such as HTML, JSON etc. so that I can reuse the content in other systems.
5) I'd love to see a video or article showing what effect the ‘Why do you want to learn…’ input has on the output…or shows various ways of using Gajix.
6) Probably my most important point: I would LOVE it if Gajix could show me ‘tangential’ topics that would probably be of interest to viewers of the current topic. Eg: If the topic is ‘Excel’, then tangential topics might be ‘Data Analysis’, or ‘Data science’, or ‘Engineering calculations’ or MathCad etc. This would help users to discover areas of interest just outside their current area of focus.

Anyway, I got far better output and ideas for SEO content from Gajix (and WAY faster) than using other SEO tools from my toolbox.

Seriously, just give it a try ;-)