Amend Data Preparation guide

[neomatrix369]

Adding Visualization sub-topic to Data preparation guide. Changes to create placeholders for links and contents to come across the other guides.

The overall structure and/or the content may change as new content gets closer to finalisation. But this is an evolving topic, so it's going to be continuously amended even after we merge the first finalised version.

[neomatrix369]

@clone95 let's start discussing the contents of this guide I have done lots of reorg and also added my own ideas to it. Although I keep thinking there are still small things I might have missed but together we can fill these missing parts.

[neomatrix369]

Let's also pick up tips from here https://www.linkedin.com/posts/shivan-kumar_datascience-machinelearning-deeplearning-activity-6732600618751442944-kNRY

[neomatrix369]

@clone95 please invite anyone else to review this PR if you feel the need

[clone95]

Very good job! 💯

I list here some of the more general comments, but it's mostly a braindump for me. Soon I will build a very small "editorial" guide for contributing, with both stylistic and formatting guidelines ( #141 ). So these comments are direct most to the old "me" when I was writing the old versione of the guide 1 year ago :

• can't find some sections (like lowercaseUppercase..) in the final draft
• the web app shows the subtitle (in the contextual menu on the left) only if ## or # is used. with more or equal than 3#### it doesn't shows it

Formatting

• always use Virgilio as a third person, never 1st person ("I colleted for you..." --> "Virgilio collected for you...")
• very minor stylist corrections like "s" and "z"
• the formatting can be improved, using bold, italic, and splitting sentences
• avoid long periods
• avoid sentences with more than 1 or 2 dependant sentences. If it cannot be done, re-think the design of the sentence
• split groups of more than 3-4 lines of text

[neomatrix369]

@clone95 I have finished this iteration of review, can you pls re-read the changes and my comments and come back with some suggestions and resolutions so we can wind up this guide for now

Let me know if I have missed anything and if it's within the guidelines you mentioned here.

[neomatrix369]

@clone95 Any more updates for this one before it can be merged?

[clone95]

Nice Mani! I think we are close to ready. I will push a couple of formatting fixes, then I will merge the PR