On top of the Examples and the User Guide, we have a Tutorial section. This part of the docs is quite old, and some of it became redundant with the UG and / or the examples. Lots of users will be drawn to the tutorials page at some point, so I feel like it's important that we give it the attention it deserves, just as we do for the UG.

Here's a proposal on how to deal with each section of the current Tutorial page:

1. An introduction to machine learning with scikit-learn: This is what used to be our "Quick Start" guide before it was re-written in [MRG] DOC New Getting Started guide #14920. I find this doc quite strange and unintuitive, because it deals with very different levels of expertise: it starts by introducing ML, and it ends up by detailing how to cast data to flaot64.

   I would suggest to completely remove this guide, or alternatively, to somewhat merge it with the next one (2.)

2. A tutorial on statistical-learning for scientific data processing: This looks like excellent material (from @GaelVaroquaux I think?), and I believe this should actually be our whole "Tutorials" page. There are however a few issues with this guide:

   • it's quite old (up to 9 years old), so some sections might not follow our current best practice
   • there are layout issues as e.g. here (fixed in DOC Tutorial structure and layout #18261)
   • it's hard to navigate between sections, since the sidebar isn't updated as one might expect.

   I would suggest to:

   • make a careful pass over it and update it to our recommended best practices / introduce recent tools
   • fix the layout issues (done in DOC Tutorial structure and layout #18261)
   • fix the sidebar issues
   • make this the entire "Tutorials" section of the docs
   • maybe integrate stuff from 1.

3. Working With Text Data: This thing looks like it could be just an Example, so we can probably remove it from the Tutorials page. I haven't checked but I think we already have similar examples, so we could merge this one with some others

4. Choosing the right estimator: I think our users love this pic, and @amueller (the author) now hates it ^^. Maybe it could just stay there, or we could transform it into an example.

5. External Resources, Videos and Talks: this section presents some super old tutorial videos, the most recent is from 2013. I think we could:

   • update it to the more recent tutorials e.g. those given recently at Scipy and EuroScipy.
   • Make it a subsection of 2., if 2. becomes the whole "Tutorials" page as suggested.

Of course these are only suggestions, I'm happy to discuss alternatives.